implement optional 'pushurl' in the manifest file

Allow the 'remote' element in the manifest file to define an optional
'pushurl' attribute which is passed into the .git/config file.

Change-Id: If342d299d371374aedc4440645798888869c9714
Signed-off-by: Steve Rae <steve.rae@raedomain.com>

project.py

@@ -320,11 +320,13 @@ class RemoteSpec(object):
   def __init__(self,
                name,
                url=None,
+               pushUrl=None,
                review=None,
                revision=None,
                orig_name=None):
     self.name = name
     self.url = url
+    self.pushUrl = pushUrl
     self.review = review
     self.revision = revision
     self.orig_name = orig_name
@@ -1825,6 +1827,7 @@ class Project(object):
 
       remote = RemoteSpec(self.remote.name,
                           url=url,
+                          pushUrl=self.remote.pushUrl,
                           review=self.remote.review,
                           revision=self.remote.revision)
       subproject = Project(manifest=self.manifest,
@@ -2346,6 +2349,7 @@ class Project(object):
     if self.remote.url:
       remote = self.GetRemote(self.remote.name)
       remote.url = self.remote.url
+      remote.pushUrl = self.remote.pushUrl
       remote.review = self.remote.review
       remote.projectname = self.name