Code cleanup

Whe getting a stream request in all cases the body is read. Thus
it makes sense to do the receiving once and the different cases
based on the status next.

Change-Id: If4d8436a85c8a62aa9f77eae51d4cdb3a20943f6
Reviewed-on: http://review.couchbase.org/33750
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: buildbot <build@couchbase.com>