СBQE-1119: couchbase-cli testBucketModification

Change-Id: I4504cce8029695e4d8045dcea707620563f11323
Reviewed-on: http://review.couchbase.org/27278
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>