* stable-3.3:
Polygerrit: Wipe out license headers in minified gr-app.js
ReceiveCommits: Avoid use of secondary index in readChangesForReplace
Fix 'is:submittable' query on multiple submit records
Fix 'is:submittable' query on multiple submit records
Update git submodules
Change-Id: I32167e21189b488c9d88d00ca33b3c5c1fd4eda1