Delete router broken for NSX-mh

[Salvatore Orlando]

Starting with 1e00041b0bcb83175760eb6347bb3eae55649328 delete_router invokes a plugin operation for removing router ports, whereas previously it simply took care of removing information for the port from the database.

While this change has been beneficial for many plugins, it did not work for NSX-mh.
Indeed the NSX-mh removes the logical router from the backend before moving on to the database operation.
As the database operation now attempts to operate on the backend object, this fails because the object has been deleted in the meanwhile.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/159653
Committed: https://git.openstack.org/cgit/stackforge/vmware-nsx/commit/?id=2f46cd7afdd002a0d139896df3952939d4c83ca0
Submitter: Jenkins
Branch: master

commit 2f46cd7afdd002a0d139896df3952939d4c83ca0
Author: Salvatore Orlando <email address hidden>
Date: Thu Feb 26 14:58:45 2015 -0800

    Do not attempt ext gw port reset for deleted routers

    This patch prevents _nsx_delete_ext_gw_port from attempting to
    operate on the external gateway port for a router which has
    already been deleted from the backend.
    This situation occurs since the behaviour of delete_router
    has been changed by 1e00041b0bcb83175760eb6347bb3eae55649328

    Closes-Bug: #1426570

    Change-Id: I2029df5227e312815fa3f955bfd1bcc19c5216b5