MB-100: Remove kvstore apis for getting shard information

These are no longer needed since we don't support sqlite anymore

Change-Id: I107316edc4425b3faf82eac78df8219ba54effbe
Reviewed-on: http://review.couchbase.org/25675
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>