Tests: Fix traceback.

Tests: Fix traceback.

        self.assertTrue(packet.haslayer(msg_type))
      File "/usr/lib/python2.7/unittest/case.py", line 422, in assertTrue
        raise self.failureException(msg)
    AssertionError: 0 is not true

* Scapy packet.haslayer() returns 1 or 0.
  Replace with assertEqual(packet.haslayer(), 1) to fix tracebacks.

* Scapy has multiple layers called TCP/UDP
  Specify the module name to prevent namespace collisions.

* Remove duplicate import.

Change-Id: I600f9f330075cd40e1da50f8b2ceb24f645f2c20
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>