update loxigen-artifacts

Pulls in 32-bit build fixes, bsn_role_status, and bsn_controller_connections.
OFConnectionManager: implement bsn_role_status extension

This is a backport of the OpenFlow 1.4 functionality. When we support OpenFlow
1.4, the new ind_cxn_send_role_status function will send that message (to a 1.4
connection) instead.
OFConnectionManager: implement bsn_controller_connections extension

This extension allows the controller to query all configured controller
connections and their current state.
OFConnectionManager: handle error from append_bind
Merge into master from pull request #77:
BSN role status and controller query implementations (https://github.com/floodlight/indigo/pull/77)