Remove libvirt virbr0

virbr0 is causing consul to take the ip assigned to it for dns which causing
connectivity failures.
Fixed neutron test failures

Neutron test was failing because the shared network was shown in net-list and
the script tried to delete, but it did not as that network was of different
tenant. Fixed it by only querying its own network by adding -D
Merge pull request #158 from hkumarmk/compute

Compute
Added route target in contrail config database

This is required to get internet connectivity to VM through floating IPs.