rename q_exc to n_exc

[Aaron Rosen]

There are still a few places in the code base where q_exc was not renamed to n_exc during the quantum->neutron rename.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/46782

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/46782
Committed: http://github.com/openstack/nova/commit/ec91e8fa7f270d34e050b3d303ee376d122b77d9
Submitter: Jenkins
Branch: master

commit ec91e8fa7f270d34e050b3d303ee376d122b77d9
Author: Aaron Rosen <email address hidden>
Date: Mon Sep 16 10:58:29 2013 -0700

    Fix rename q_exc to n_exc (from quantum to neutron)

    The patch fixes one file where q_exc was not renamed to n_exc during
    the quantum to neutron rename.

    Fixes bug: 1226162

    Change-Id: I77625324b378bbe0e1461e5fea77c9747ca33624