syncbase/vsync: add sync watcher

Add the sync watcher thread to read batches of store log entries
and apply them to the sync metadata.  Provide a hook for the
SyncGroup create/join/leave methods to inform the watcher of
changes to the key prefixes to sync.

Change-Id: Ic30f02c5506d01a09dbddde245b0b149a62c72e4
11 files changed
tree: 490b62f72898139efed438894bf51d0c40279280
  1. v23/
  2. x/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. VERSION