Tap don't support hello (and datatype extension)

All datatype bits must be specified as RAW over the connection

Change-Id: I0d832286cfd8a2a4a663414744839a4370b7c5dc
Reviewed-on: http://review.couchbase.org/35592
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>