-- Initial cut for event notification on metadata changes
-- use separate local repo for coordinator (vs. watcher)
-- fix coordinator for keeping track of epoch and txnid persistently
-- use same logger as indexer
-- conform to the same error handling pattern as indexer

Change-Id: Ic6e93abdc3c191965626b7aae10252d3416f95b7
Reviewed-on: http://review.couchbase.org/41732
Reviewed-by: Pratap Chakravarthy <prataprc@couchbase.com>
Reviewed-by: John Liang <johliang00@gmail.com>
Tested-by: John Liang <johliang00@gmail.com>