MB-9062: always send set-with-meta options

So that we can be sure we're speaking to 2.1.0+ node which understands
those and most importantly is doing xdcr-style conflict resolution.

Otherwise it's possible for xmem replication to replicate to 2.0.1
nodes thinking that conflict resolution happens automagically on the
other side when it's not the case.

Change-Id: I1e15d89932bab8bbcbee933220ae4e08e15e052e
Reviewed-on: http://review.couchbase.org/28799
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>