is_compat => is_v220_compat

Change-Id: I06e5825a1a59112cd3b93fb8c46e30718dd2a450
Reviewed-on: http://review.couchbase.org/35012
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>