MB-18565: Return storageMode in indexStatus API call.
MB-18565: Return storageMode in indexStatus API call.

Change-Id: I0420dff2f8aca214808ae4c4eab48f63c6272bc3
Reviewed-on: http://review.couchbase.org/62076
Tested-by: Poonam D <6855f09986fe28ed7e8cdd9d60db878d898703d5@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

membase/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server