add default aptly config files

config rfiles are read in the following order:

1) ~/.aptly.conf
2) /usr/local/etc/aptly.conf
3) /etc/aptly.conf

context/context.go

@@ -96,12 +96,11 @@ func (context *AptlyContext) config() *utils.ConfigStructure {
 				Fatal(err)
 			}
 		} else {
-			configLocations := []string{
-				filepath.Join(os.Getenv("HOME"), ".aptly.conf"),
-				"/etc/aptly.conf",
-			}
+			homeLocation := filepath.Join(os.Getenv("HOME"), ".aptly.conf")
+			configLocations := []string{ homeLocation, "/etc/aptly.conf", }
 
 			for _, configLocation := range configLocations {
+				// FIXME: check if exists, check if readable
 				err = utils.LoadConfig(configLocation, &utils.Config)
 				if err == nil {
 					break
@@ -112,7 +111,7 @@ func (context *AptlyContext) config() *utils.ConfigStructure {
 			}
 
 			if err != nil {
-				fmt.Fprintf(os.Stderr, "Config file not found, creating default config at %s\n\n", configLocations[0])
+				fmt.Fprintf(os.Stderr, "Config file not found, creating default config at %s\n\n", homeLocation)
 
 				// as this is fresh aptly installation, we don't need to support legacy pool locations
 				utils.Config.SkipLegacyPool = true

system/t03_help/MainHelpTest_gold

@@ -12,7 +12,7 @@ package environment to new version.
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends

system/t03_help/MainTest_gold

@@ -20,7 +20,7 @@ Use "aptly help <command>" for more information about a command.
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends

system/t03_help/MirrorCreateHelpTest_gold

@@ -14,7 +14,7 @@ Example:
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends

system/t03_help/MirrorCreateTest_gold

@@ -5,7 +5,7 @@ aptly mirror create - create new mirror
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends

system/t03_help/MirrorHelpTest_gold

@@ -16,7 +16,7 @@ Use "mirror help <command>" for more information about a command.
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends

system/t03_help/MirrorTest_gold

@@ -16,7 +16,7 @@ Use "mirror help <command>" for more information about a command.
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends

system/t03_help/WrongFlagTest_gold

@@ -6,7 +6,7 @@ aptly mirror create - create new mirror
 
 Options:
   -architectures="": list of architectures to consider during (comma-separated), default to all available
-  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
+  -config="": location of configuration file (default locations in order: ~/.aptly.conf, /usr/local/etc/aptly.conf, /etc/aptly.conf)
   -db-open-attempts=10: number of attempts to open DB if it's locked by other instance
   -dep-follow-all-variants: when processing dependencies, follow a & b if dependency is 'a|b'
   -dep-follow-recommends: when processing dependencies, follow Recommends