Remove support for the extra <remote> definitions in manifests

These aren't that widely used, and actually make it difficult for
users to fully mirror a forest of repositories, and then permit
someone else to clone off that forest, rather then the original
upstream servers.

Signed-off-by: Shawn O. Pearce <sop@google.com>

project.py

@@ -230,7 +230,6 @@ class Project(object):
     self.relpath = relpath
     self.revision = revision
     self.snapshots = {}
-    self.extraRemotes = {}
     self.copyfiles = []
     self.config = GitConfig.ForRepository(
                     gitdir = self.gitdir,
@@ -579,9 +578,6 @@ class Project(object):
       self._InitGitDir()
 
     self._InitRemote()
-    for r in self.extraRemotes.values():
-      if not self._RemoteFetch(r.name):
-        return False
     if not self._RemoteFetch():
       return False
 
@@ -1083,17 +1079,6 @@ class Project(object):
         remote.ResetFetch(mirror=True)
       remote.Save()
 
-    for r in self.extraRemotes.values():
-      remote = self.GetRemote(r.name)
-      remote.url = r.fetchUrl
-      remote.review = r.reviewUrl
-      if r.projectName:
-        remote.projectname = r.projectName
-      elif remote.projectname is None:
-        remote.projectname = self.name
-      remote.ResetFetch()
-      remote.Save()
-
   def _InitMRef(self):
     if self.manifest.branch:
       msg = 'manifest set to %s' % self.revision