Cleanup common.debug

The debug module has a list of iptables tables but not used it. This
commit fixes it.

Change-Id: Iefb1d6a17ddc01823d5c0a524ffda8723df4d9da
Add os-migration tests for Nova v2 API

v2 os-migration API returns a body which includes the info like:

  {
    "migrations": [
      {
        "id": 1,
        "status": "finished",
        "instance_uuid": "e9e4fdd7-f956-44ff-bfeb-d654a96ab3a2",
        "source_node": "localhost-dev",
        "source_compute": "localhost-dev",
        "dest_node": "localhost-dev",
        "dest_compute": "localhost-dev",
        "dest_host": "192.168.11.100",
        "old_instance_type_id": 6,
        "new_instance_type_id": 2,
        "created_at": "2014-03-18T00:14:49.000000",
        "updated_at": "2014-03-18T00:15:15.000000"
      }
    ]
  }

This patch adds this API tests.

This patch adds tests for JSON format only without XML format because
the XML support has been marked as deprecated in Nova with the commit
I4acc15ce5f487738bb34a95c2261a5d05d827d8d and it will be removed in
Juno cycle.

Change-Id: I0e19b776313eff98d157e1249333174908061798
Merge "Cleanup common.debug"
Merge "Add os-migration tests for Nova v2 API"