rietveld: retry more transient errors.

Namely these errors when applying patch:

  <urlopen error [Errno 10060] A connection attempt failed
  because the connected party did not properly respond after
  a period of time, or established connection failed because
  connected host has failed to respond>

  <urlopen error [Errno 104] Connection reset by peer>

R=sergiyb@chromium.org,phajdan.jr@chromium.org
BUG=601260

Review URL: https://codereview.chromium.org/1876093002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299837 0039d316-1c4b-4281-b951-d872f2087c98

rietveld.py

@@ -441,7 +441,11 @@ class Rietveld(object):
             for retry_anyway in (
                 'Name or service not known',
                 'EOF occurred in violation of protocol',
-                'timed out'):
+                'timed out',
+                # See http://crbug.com/601260.
+                'urlopen error [Errno 10060] A connection attempt failed',
+                'urlopen error [Errno 104] Connection reset by peer',
+            ):
               if retry_anyway in reason_as_str:
                 return True
             return False  # Assume permanent otherwise.