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
java_gen: add virtual getVersion method to all OFObjects
java_gen: create DEFAULT instance for objects that support it (for Match)

Objects which consist only of parts that have a default value
now get a default value.

Match, in particular, now defines a default instance that wildcards
everything and is available as factory.matchWildcardAll()
Merge into master from pull request #81:
a bunch of smaller improvements (https://github.com/floodlight/loxigen/pull/81)
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)
Merge branch 'master' of github.com:floodlight/loxigen

Conflicts:
	java_gen/java_type.py