changes in build icmp packet api to accomodate ip identification, icmp checksum and icmp data
addressed review comments
Merge into master from pull request #105:
update pyloxi to floodlight/loxigen-artifacts@0b4fb635bf2c6839a667f01fcc... (https://github.com/floodlight/oftest/pull/105)
bsn_gentable: expect no reply when deleting a nonexistent message

Behavior changed by https://github.com/floodlight/loxigen/pull/193
Merge into master from pull request #106:
bsn_gentable: expect no reply when deleting a nonexistent message (https://github.com/floodlight/oftest/pull/106)
Merge into master from pull request #108:
changes in build icmp packet api (https://github.com/floodlight/oftest/pull/108)
add bsn_role_status testcase
add bsn_controller_connections test

Not much we can test besides making sure the reply was sent and is well formed.
Merge into master from pull request #93:
BSN role status and controller connections tests (https://github.com/floodlight/oftest/pull/93)
update pyloxi to floodlight/loxigen-artifacts@6bc35bacb8ac44ebfc391b8bf98e51262449fe0d