Added Extension messages for PDU management on switches
added an expectation field for of_bsn_set_port_pdu_expected_rx_info_request
address review comments

also removed data from pdu timeout notification
add slot_num
Merge branch 'master' of github.com:floodlight/loxigen

Conflicts:
	c_gen/templates/loci_show.h
Merge into master from pull request #77:
Added Extension messages for PDU management on switches (https://github.com/floodlight/loxigen/pull/77)