Deleting router without deleting router-interface deletes router from VSD

[Aniket Dandekar]

PROBLEM
------------
Deleting Router from neutron without deleting router-interface deletes router from VSD but not from neutron.

STEPS TO REPRODUCE
 ---------------------------
1. Add router Router1
2. Add network Network1 and subnet Subnet1
3. Add router-interface Subnet1 Router1
4. Now delete Router directly without deleting interface
5. Router does not get deleted from neutron but gets wiped off from VSD.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/84304

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/84304
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=cffcd56d4b58429a409b55fc1db792df3fbc24c7
Submitter: Jenkins
Branch: master

commit cffcd56d4b58429a409b55fc1db792df3fbc24c7
Author: ronak <email address hidden>
Date: Mon Mar 31 18:09:42 2014 -0700

    Nuage Plugin: Delete router requires precommit checks

    There exist a case where deleting router from neutron without
    deleting router-interface deletes router from VSD but not from neutron.
    If router has an interface with subnet router deletion is not allowed.
    Needs to precheck this condition before deleting router from
    backend (VSD).

    Change-Id: I4ba7eff399acda0427505328355dbfb931d62587
    Closes-Bug: #1298635