Add more mutation operation tests using v3 api

Change-Id: I1c6e5a28e65628843e2f6548855e710ec8a5fc1c
Reviewed-on: http://review.couchbase.org/43521
Tested-by: Subhashni Balakrishnan <b.subhashni@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>