Add detailed lcb_cntl tests

We've just changed some of the handlers to become macros - we need tests
for this in case something silly happens.

Change-Id: I1bd4ac2323323bb87382c569d46a77fd6a20301e
Reviewed-on: http://review.couchbase.org/39457
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>