tree 97b9b81dc18b7b5acdf933b08e6ee6085c80ce34
parent 45233db454b00bbea57a1ff94a1b6693d07db739
author Pavlin Radoslavov <pavlin@onlab.us> 1397092759 -0700
committer Gerrit Code Review <gerrit2@onos-services> 1397137652 -0700

Fix issues found by FindBugs: BC_IMPOSSIBLE_INSTANCEOF

http://findbugs.sourceforge.net/bugDescriptions.html#BC_IMPOSSIBLE_INSTANCEOF

* Fixed TCP/UDP/ICMP packet casting issue
  The issue is fixed by using the IP packet payload to test
  it whether it is TCP/UDP/ICMP
* Fixed a typo: unknwon -> unknown
* Added an additional log output if the type of the IPv4 payload is unknown.

Change-Id: I9f6a42d4058d7793ba0233bd0311c2c6df590900