Update to latest libhtp master.
Remove deprecated functionality.

HOOK_DECLINED -> HTP_DECLINED
HOOK_ERROR -> HTP_ERROR
HOOK_STOP -> HTP_STOP
HOOK_OK -> HTP_OK

cp.register_transaction_start() -> cp.register_request_start()
cp.register_request() -> cp.register_request_complete()
cp.register_response() -> cp.register_response_complete()
Bump to 0.11.