Code cleanup for Freescale FWaaS Plugin

[Trinath Somanchi]

There are certain improvements required for Freescale FWaaS Plugin.

[1] Freescale CI information and CI contact details in README.rst
[2] Moving neutron based imports to third party library imports block in all files.
[3] Add LOG.exception to _update_firewall_status.

Doug comments from https://review.openstack.org/#/c/148884/8

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/152856

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/152856
Committed: https://git.openstack.org/cgit/openstack/neutron-fwaas/commit/?id=a653457a8c1489d5c63525f9daf033ea7cd64782
Submitter: Jenkins
Branch: master

commit a653457a8c1489d5c63525f9daf033ea7cd64782
Author: Trinath Somanchi <email address hidden>
Date: Wed Feb 4 17:03:59 2015 +0530

    Code cleanup for Freescale FWaaS Plugin

    - Freescale CI information and CI contact details in README.rst
    - Moving neutron based imports to third party library imports
      block in all files.
    - Add LOG.exception to _update_firewall_status.

    Change-Id: I7c9150b37c4d4260eac30343ba5078071ede04ef
    Closes-Bug: #1417190