prs: use the PRServer to replace the BB_URI_LOCALCOUNT functionality

- adapt the PRServer to generate an incremental number for every revision set
associated with a (PN, PV)
- use one incrementing value rather than several
- PV becomes 0.1+gitAUTOINC+deadbeefdecafbad_decafbaddeadbeef
- if PV contains 'AUTOINC' set PKGV to the same thing with AUTOINC replaced
with the "auto PR" value
- if the PRServer isn't running replace AUTOINC with 0 (no package feeds, but usual
image creation would work)
- use the PR table with "AUTOINC-${PV-without-SRCREVs}" as key
- modify prexport/primport to address the generated srcrev entries
- this patch addresses the following proposal:
http://lists.linuxtogo.org/pipermail/bitbake-devel/2012-November/003878.html

(From OE-Core rev: b27b438221e16ac3df6ac66d761b77e3bd43db67)

Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/prserv.bbclass

@@ -1,6 +1,11 @@
 def prserv_get_pr_auto(d):
     import oe.prservice
+    import re
+
+    pv = d.getVar("PV", True)
     if d.getVar('USE_PR_SERV', True) != "1":
+        if 'AUTOINC' in pv:
+            d.setVar("PKGV", pv.replace("AUTOINC", "0"))
         bb.warn("Not using network based PR service")
         return None
 
@@ -8,14 +13,21 @@ def prserv_get_pr_auto(d):
     pkgarch = d.getVar("PACKAGE_ARCH", True)
     checksum = d.getVar("BB_TASKHASH", True)
 
+    conn = d.getVar("__PRSERV_CONN", True)
+    if conn is None:
+        conn = oe.prservice.prserv_make_conn(d)
+        if conn is None:
+            return None
+
+    if "AUTOINC" in pv:
+        srcpv = bb.fetch2.get_srcrev(d)
+        base_ver = "AUTOINC-%s" % version[:version.find(srcpv)]
+        value = conn.getPR(base_ver, pkgarch, srcpv)
+        d.setVar("PKGV", pv.replace("AUTOINC", str(value)))
+
     if d.getVar('PRSERV_LOCKDOWN', True):
         auto_rev = d.getVar('PRAUTO_' + version + '_' + pkgarch, True) or d.getVar('PRAUTO_' + version, True) or None
     else:
-        conn = d.getVar("__PRSERV_CONN", True)
-        if conn is None:
-            conn = oe.prservice.prserv_make_conn(d)
-            if conn is None:
-                return None
         auto_rev = conn.getPR(version, pkgarch, checksum)
 
     return auto_rev