Add another error code where gclient sync should retry.

TBR=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8233033

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@104959 0039d316-1c4b-4281-b951-d872f2087c98

scm.py

@@ -471,7 +471,8 @@ class SVN(object):
                 x.startswith('svn: PROPFIND of') or
                 x.startswith('svn: REPORT of') or
                 x.startswith('svn: Unknown hostname') or
-                x.startswith('svn: Server sent unexpected return value')):
+                x.startswith('svn: Server sent unexpected return value') or
+                x.startswith('svn: Can\'t connect to host')):
               return True
           return False