Merge branch 'stable-3.10'

* stable-3.10:
  Indexing retries: lower normal condition logs to debug
  Check for existence of change's target SHA1 for reindexing
  Do not remove replication.jar from multi-site test sites
  Update local setup script to stable-3.10

Change-Id: Id752c5baf0776f845469af94c102992682ce61cd