Adapt to new lcbio_TABLE/lcb_settings refactor

Use helper APIs instead.

Change-Id: Ib277109462cb421c2c00b46ffba5753532bf4025
Reviewed-on: http://review.couchbase.org/35880
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>