Add --monitor to bmgr backupnow

And --monitor-verbose. For debugging.

Test: adb shell bmgr backupnow --monitor <packages> and verify output
Test: adb shell bmgr backupnow --monitor-verbose <packages> and verify
      output

Change-Id: I6c0a46a6b642063c37e548e181f4659dd46426a5
1 file changed