Remove get_snat_ns_name from dvr.py

[Paul Michali]

This method was needed, until VPN has been updated to use the DVR router object snat_namespace.name attribute.

Also fixing PEP8 error in event_observer.py.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/163586

[Paul Michali (pcm)]

Looks like PEP8 was fixed and upstreamed, so this will only remove the dead code.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/163586
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=bd30eb655c7ddb240aee5562c1db3fed0e09d722
Submitter: Jenkins
Branch: master

commit bd30eb655c7ddb240aee5562c1db3fed0e09d722
Author: Paul Michali <email address hidden>
Date: Wed Mar 11 15:38:44 2015 -0400

    Remove dead code

    Since VPNaaS has been updated, the get_snat_ns_name() method
    is no longer needed.

    Change-Id: Id852614efc5ef20f8dc2c8ed5cd0b97b354e995e
    Closes-Bug: #1430967