changes in build icmp packet api to accomodate ip identification, icmp checksum and icmp data
addressed review comments
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.