Bug 1000: Fixed unstable tests in manager.integrationtest.

  * testIListenDataPacket()
    * Fixed invalid initial value of count down latch used to wait for
      completion of flow installation.
    * Need more time to wait for flow entries.
    * Ensure that required edge is established before test.
  * testIListenRoutingUpdates()
    * Check vBridge state using VTN manager listener.
  * FlowProgrammerService.mapNF needs to be synchronized.

Change-Id: I89fc5763924ed4216ec81a7b1676984c433c60de
Signed-off-by: Shigeru Yasuda <s-yasuda@da.jp.nec.com>
Merge "Bug 1000: Fixed unstable tests in manager.integrationtest."