GOCBC-294: Correctly parse status codes in altresponses.
GOCBC-294: Correctly parse status codes in altresponses.

Motivation
----------
A bug was discovered which causes the status code to not
be parsed correctly from server responses using the
alternate encoding.

Changes
-------
Added missing check to ensure that alternately encoded
responses are parsed as status-containing messages as
opposed to vbucket-containing messages.

Change-Id: I3667f1aa7260055201caf859ca7d9c1b3ebde963
Reviewed-on: http://review.couchbase.org/93087
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/gocbcore