Treat 'revert' like 'update' in gclient.

This cl ensures that gclient enforces sane revision overrides and
onfiguration when running a revert, just like it does on a normal sync/update.

R=iannucci@chromium.org
BUG=420919

Review URL: https://codereview.chromium.org/1160113003.

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295571 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1502,7 +1502,7 @@ been automagically updated.  The previous version is available at %s.old.
     revision_overrides = {}
     # It's unnecessary to check for revision overrides for 'recurse'.
     # Save a few seconds by not calling _EnforceRevisions() in that case.
-    if command not in ('diff', 'recurse', 'runhooks', 'status'):
+    if command not in ('diff', 'recurse', 'runhooks', 'status', 'revert'):
       self._CheckConfig()
       revision_overrides = self._EnforceRevisions()
     pm = None