Use bridge address to reach local nameserver on the host.

If the host resolv.conf contains only a local nameserver allow
the container to take advantage of that instead of using the
default nameservers.

Signed-off-by: Sami Wagiaalla <swagiaal@redhat.com>
How can you be sure this is the bridge IP on any system but your own environment?  This is probably causing your drone failure as the bridge IP is probably not matching your local system.  To make this test more robust you will need to parse the `docker0` IP from the environment.