prserv: change PRSERV_HOST semantics

- remove PRSERV_PORT variable
- use 'hostname:port' as PRSERV_HOST format
- remove USE_PR_SERV variable
- one can activate PRS by setting PRSERV_HOST

[YOCTO #3744]

(From OE-Core rev: e00f49de8b1f79c3e07b887d257bd75a46052fa0)

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

meta/classes/package.bbclass

@@ -396,15 +396,13 @@ def runtime_mapping_rename (varname, d):
 #
 
 python package_get_auto_pr() {
-    # per recipe PRSERV_HOST PRSERV_PORT
+    # per recipe PRSERV_HOST
     pn = d.getVar('PN', True)
     host = d.getVar("PRSERV_HOST_" + pn, True)
-    port = d.getVar("PRSERV_PORT_" + pn, True)
     if not (host is None):
         d.setVar("PRSERV_HOST", host)
-    if not (port is None):
-        d.setVar("PRSERV_PORT", port)
-    if d.getVar('USE_PR_SERV', True) != "0":
+
+    if d.getVar('PRSERV_HOST', True):
         try:
             auto_pr=prserv_get_pr_auto(d)
         except Exception as e:

meta/classes/prserv.bbclass

@@ -3,7 +3,7 @@ def prserv_get_pr_auto(d):
     import re
 
     pv = d.getVar("PV", True)
-    if d.getVar('USE_PR_SERV', True) != "1":
+    if not d.getVar('PRSERV_HOST', True):
         if 'AUTOINC' in pv:
             d.setVar("PKGV", pv.replace("AUTOINC", "0"))
         bb.warn("Not using network based PR service")