CCBC-483: don't use nmv payload if CCCP is disabled

If certain bugs are discovered with the CCCP payload then we can rely on
a pure HTTP config.

Change-Id: Ie113bc79ccd9ee7aff2c583104b95f04c04375cc
Reviewed-on: http://review.couchbase.org/39974
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>