RCBC-150 Update list of options to Cluster.create_bucket

Change-Id: I26c5cb04dfe6d17391fb15bcbeac236e2afd1c28
Reviewed-on: http://review.couchbase.org/30754
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Reviewed-by: Jasdeep Jaitla <jasdeep@couchbase.com>