StreamManager - handle panic in gorountine so service would not be interrupted
Timer - handle panic in gorountine so timer would not be interrupted
Topology - update the topology before the index defn is created
Topology - Coordinator picks the least used node for the new index, if node info is not specified at time of index creation
IndexManager/Timer - return a channel of stability timestamp for each stream

Change-Id: Id2adfa03a94845ca6975440512e6c05042c76685
Reviewed-on: http://review.couchbase.org/42690
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Reviewed-by: John Liang <johliang00@gmail.com>
Tested-by: John Liang <johliang00@gmail.com>