[automerger skipped] Wait for available rollbacks in RollbackTest. am: 77a40731 am: 170a5198
am: 129a2c09 -s ours
am skip reason: change_id I27e2513b34f49af2f41cd627a5d2550541831e11 with SHA1 0a3c06e9 is in history
Change-Id: I20a737c4da3e8ad730a24fa9c2764bd38325a144