lcbht: fix lcbht_reset()

lcbht_reset() should also call http_parser_init() to reset the inner
state. This should also be called from lcbht_new() as well.

Change-Id: Iaf882733828c311ecd1787223f0fb52df69b067e
Reviewed-on: http://review.couchbase.org/37858
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>