Indicate trivial rebase and commit message update on push

Indication is appended to "Uploaded patch set N" message
in the review history.

For trivial rebase:
  Uploaded patch set 3: Patch set 2 was rebased.

For commit message update:
  Uploaded patch set 3: Commit message was updated.

Change-Id: Ic5e7c45feb2ea5f1b4607f5103153aa70ae6d7da
1 file changed