Add new option for detailed logging on dependency resolving

This adds command-line arg and config option, with option enabled
aptly is more verbose on internal depeendency resolving cycles:

```
Missing dependencies: file-rc (>= 0.8.16) [amd64], python:any (>= 2.7.1-0ubuntu2) [amd64], python3:any (>= 3.3.2-2~) [amd64], file-rc [amd64], perl (<< 5.17) [amd64], iptables-router (>= 1.2.3) [amd64], systemd [amd64], sgml-base (>= 1.26+nmu2) [amd64], sed (>= 4.1.2-8) [amd64]
Unsatisfied dependency: file-rc (>= 0.8.16) [amd64]
Unsatisfied dependency: python:any (>= 2.7.1-0ubuntu2) [amd64]
Unsatisfied dependency: python3:any (>= 3.3.2-2~) [amd64]
Unsatisfied dependency: file-rc [amd64]
Unsatisfied dependency: perl (<< 5.17) [amd64]
Unsatisfied dependency: iptables-router (>= 1.2.3) [amd64]
Unsatisfied dependency: systemd [amd64]
Injecting package: sgml-base_1.26+nmu4ubuntu1_all
Injecting package: sed_4.2.2-4ubuntu1_amd64
```

system/t02_config/ConfigShowTest_gold

@@ -7,6 +7,7 @@
     "dependencyFollowRecommends": false,
     "dependencyFollowAllVariants": false,
     "dependencyFollowSource": false,
+    "dependencyVerboseResolve": false,
     "gpgDisableSign": false,
     "gpgDisableVerify": false,
     "downloadSourcePackages": false,

system/t02_config/CreateConfigTest_gold

@@ -7,6 +7,7 @@
   "dependencyFollowRecommends": false,
   "dependencyFollowAllVariants": false,
   "dependencyFollowSource": false,
+  "dependencyVerboseResolve": false,
   "gpgDisableSign": false,
   "gpgDisableVerify": false,
   "downloadSourcePackages": false,

system/t03_help/MainHelpTest_gold

@@ -17,4 +17,5 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs
 

system/t03_help/MainTest_gold

@@ -25,4 +25,5 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs
 ERROR: unable to parse command

system/t03_help/MirrorCreateHelpTest_gold

@@ -19,6 +19,7 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs
   -filter="": filter packages in mirror
   -filter-with-deps=false: when filtering, include dependencies of matching packages as well
   -force-architectures=false: (only with architecture list) skip check that requested architectures are listed in Release file

system/t03_help/MirrorCreateTest_gold

@@ -10,6 +10,7 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs
   -filter="": filter packages in mirror
   -filter-with-deps=false: when filtering, include dependencies of matching packages as well
   -force-architectures=false: (only with architecture list) skip check that requested architectures are listed in Release file

system/t03_help/MirrorHelpTest_gold

@@ -21,3 +21,4 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs

system/t03_help/MirrorTest_gold

@@ -21,4 +21,5 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs
 ERROR: unable to parse command

system/t03_help/WrongFlagTest_gold

@@ -11,6 +11,7 @@ Options:
   -dep-follow-recommends=false: when processing dependencies, follow Recommends
   -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
   -dep-follow-suggests=false: when processing dependencies, follow Suggests
+  -dep-verbose-resolve=false: when processing dependencies, print detailed logs
   -filter="": filter packages in mirror
   -filter-with-deps=false: when filtering, include dependencies of matching packages as well
   -force-architectures=false: (only with architecture list) skip check that requested architectures are listed in Release file

system/t05_snapshot/PullSnapshot15Test_gold

@@ -0,0 +1,33 @@
+
+
+    [snap1]: Snapshot from mirror [wheezy-main]: http://mirror.yandex.ru/debian/ wheezy
+    [snap2]: Snapshot from mirror [wheezy-backports]: http://mirror.yandex.ru/debian/ wheezy-backports
+Building indexes...
+Dependencies would be pulled into snapshot:
+Injecting package: init-system-helpers_1.18~bpo70+1_all
+Injecting package: libestr0_0.1.9-1~bpo70+1_amd64
+Injecting package: libestr0_0.1.9-1~bpo70+1_i386
+Injecting package: libjson-c2_0.11-3~bpo7+1_amd64
+Injecting package: libjson-c2_0.11-3~bpo7+1_i386
+Injecting package: liblogging-stdlog0_1.0.4-1~bpo70+1_amd64
+Injecting package: liblogging-stdlog0_1.0.4-1~bpo70+1_i386
+Loading packages (60863)...
+Missing dependencies: 
+Missing dependencies: libestr0 (>= 0.1.4) [amd64], libjson-c2 (>= 0.10) [amd64], liblogging-stdlog0 (>= 1.0.1) [amd64], init-system-helpers (>= 1.18~) [amd64], libestr0 (>= 0.1.4) [i386], libjson-c2 (>= 0.10) [i386], liblogging-stdlog0 (>= 1.0.1) [i386], init-system-helpers (>= 1.18~) [i386]
+Snapshot snap3 successfully created.
+You can run 'aptly publish snapshot snap3' to publish snapshot as Debian repository.
+[+] init-system-helpers_1.18~bpo70+1_all added
+[+] libestr0_0.1.9-1~bpo70+1_amd64 added
+[+] libestr0_0.1.9-1~bpo70+1_i386 added
+[+] libjson-c2_0.11-3~bpo7+1_amd64 added
+[+] libjson-c2_0.11-3~bpo7+1_i386 added
+[+] liblogging-stdlog0_1.0.4-1~bpo70+1_amd64 added
+[+] liblogging-stdlog0_1.0.4-1~bpo70+1_i386 added
+[+] rsyslog_7.6.3-2~bpo70+1_amd64 added
+[+] rsyslog_7.6.3-2~bpo70+1_i386 added
+[-] libestr0_0.1.1-2_amd64 removed
+[-] libestr0_0.1.1-2_i386 removed
+[-] rsyslog_5.8.11-3_amd64 removed
+[-] rsyslog_5.8.11-3_i386 removed
+and result would be saved as new snapshot snap3.
+from snapshot:

system/t05_snapshot/pull.py

@@ -231,3 +231,16 @@ class PullSnapshot14Test(BaseTest):
         "aptly snapshot create sensu from mirror sensu",
     ]
     runCmd = "aptly snapshot pull -architectures=amd64,i386 -all-matches empty sensu destination 'sensu (>0.12)' 'sensu (<0.9.6)'"
+
+
+class PullSnapshot15Test(BaseTest):
+    """
+    pull snapshot: verbose logs
+    """
+    fixtureDB = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror wheezy-main",
+        "aptly snapshot create snap2 from mirror wheezy-backports",
+    ]
+    runCmd = "aptly snapshot pull -dep-verbose-resolve snap1 snap2 snap3 'rsyslog (>= 7.4.4)'"
+    outputMatchPrepare = lambda _, output: "\n".join(sorted(output.split("\n")))