enforce port 8092 requests to use lhttpc_manager's connections

Change-Id: I2c1b1209e39a7bae8e24194c03fd74bb82e153d7
Reviewed-on: http://review.couchbase.org/32898
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Steve Yen <steve.yen@gmail.com>