cbc: Hide datatype/snappy features

The server doesn't use them currently, so we shouldn't display them in
the CBC output.

Change-Id: Ie34e73c795a9d4c6ebbbb0d4b7e2437ac7d8fa5e
Reviewed-on: http://review.couchbase.org/42132
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>