Use new default REST port 8181 vs old 8080+8181

Use new default REST port 8181 vs old 8080+8181

ODL Oxygen after the recent odlparent version bump uses port 8181 as the
default REST API port now, vs old 8080 and 8181.

https://git.opendaylight.org/gerrit/#/c/51531/
https://lists.opendaylight.org/pipermail/controller-dev/2016-September/012677.html
https://lists.opendaylight.org/pipermail/release/2017-February/009244.html
https://lists.opendaylight.org/pipermail/integration-dev/2017-February/009062.html
https://lists.opendaylight.org/pipermail/release/2018-January/013542.html

Change-Id: I43c9dc45d08b85154fd90ec2e6c3f3f4d10be2ce
Signed-off-by: Daniel Farrell <dfarrell@redhat.com>