CCBC-404: lcbio/manager: use lcb_clist_delete

Change-Id: Iec407c53977810dcc71f183d220a01340f9da247
Reviewed-on: http://review.couchbase.org/37389
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>