Treat 'revert' like 'update' in gclient.
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: fd409f4bdeea2bb50a5d34bb4d4bfc2046a5a3dd@295571 0039d316-1c4b-4281-b951-d872f2087c98

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