CCBC-427: Apply new LCBHT system to bc_http

No need for a custom "chunk parser". http-parser does this properly.

Change-Id: Ib42a3deaf870fa9f3174986fefae5ad02645e86d
Reviewed-on: http://review.couchbase.org/37573
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>