MB-10788: Return vbucket uuid and sequence number to mutations

Return the vbucket uuid and sequence number for a store mutation
in case mutation extras is enabled

Change-Id: I41d7f6a534bd2935f029e914016d98fae3161d7e
Reviewed-on: http://review.couchbase.org/44368
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: buildbot <build@couchbase.com>