Add exceptions to whitelist for NEUTRON-157
These jobs hit NEUTRON-157 and a new exception is coming out
from an mdsal change in the api. The job below has an example.
https://logs.opendaylight.org/releng/vex-yul-odl-jenkins-1/netvirt-csit-1node-openstack-queens-gate-stateful-fluorine/290/odl_1/odl1_karaf.log.gz
https://logs.opendaylight.org/releng/vex-yul-odl-jenkins-1/netvirt-csit-1node-openstack-queens-gate-stateful-fluorine/281/odl_1/odl1_karaf.log.gz
JIRA: NETVIRT-1090
JIRA: NEUTRON-157
Change-Id: I3d2cb216e896bfd168e85cfe073f019b3aed713a
Signed-off-by: Sam Hague <shague@redhat.com>