[automerger skipped] Wait for available rollbacks in RollbackTest. am: 77a40731f8 am: 170a519878
am: 129a2c09ac -s ours
am skip reason: change_id I27e2513b34f49af2f41cd627a5d2550541831e11 with SHA1 0a3c06e9c9 is in history

Change-Id: I20a737c4da3e8ad730a24fa9c2764bd38325a144