MB-11427 Always clear datatype if remote side doesn't support it.

Change-Id: Icc015b4a173dc450c828d2ecd120bcbf2d78b251
Reviewed-on: http://review.couchbase.org/38295
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>