Update git submodules

Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Adds support for docker based opendaylight

    Previously we used ODL as a systemd service. However in newer OOO it is
    ran as a docker container. For reinstalling ODL in this case we determined
    that the best way is to not mess with docker and simply shut it down,
    and use the systemd for the CSIT verification.

    This patch stops the docker container, then copies a systemd service
    file (since RPM may never have been installed), and then allows ODL
    reinstall to proceed as usual.

    Change-Id: Ib0996ed5494f1ef37bcc232f087f563c99db62fc
    Signed-off-by: Tim Rozet <trozet@redhat.com>