remote-bzr: fixes for branch diverge

If the branches diverge we want to reset the pointer to where the remote
actually is. Since we can access remote branches just as easily as local
ones, let's do so.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/remote-helpers/git-remote-bzr

@@ -354,6 +354,7 @@ def do_import(parser):
     if os.path.exists(path):
         print "feature import-marks=%s" % path
     print "feature export-marks=%s" % path
+    print "feature force"
     sys.stdout.flush()
 
     while parser.check('import'):
@@ -716,7 +717,12 @@ def get_repo(url, alias):
             # pull
             d = bzrlib.bzrdir.BzrDir.open(clone_path)
             branch = d.open_branch()
-            result = branch.pull(remote_branch, [], None, False)
+            try:
+                result = branch.pull(remote_branch, [], None, False)
+            except bzrlib.errors.DivergedBranches:
+                # use remote branch for now
+                peer = None
+                return remote_branch
         else:
             # clone
             d = origin.sprout(clone_path, None,