Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - disable DPDK images for ARM

    We are trying to compile DPDK for the os-nosdn-ovs-ha scenario because we added TC042  "Measure network latency using testpmd and pktgen-dpdk".

    However it looks like TC042 is only enabled for compass in opnfv_os-nosdn-kvm_ovs_dpdk-ha

    https://gerrit.opnfv.org/gerrit/#/c/54659/1/tests/opnfv/test_suites/opnfv_os-nosdn-kvm_ovs_dpdk-ha_daily.yaml

    -
      file_name: opnfv_yardstick_tc042.yaml
      constraint:
          installer: compass
          pod: huawei-pod1

    We don't actually need TC042 and DPDK or os-nosdn-ovs-ha.

    But in order to run TC042 we have to know beforehand that we are going to use DPDK, so we have a conditional in the load_images.sh script that tries to guess when we will need a DPDK image.

    The conditional only checks for *[_-]ovs[_-]*
    if [[ $DEPLOY_SCENARIO == *[_-]ovs[_-]* ]]; then
        ansible-playbook \
                 -e img_property="nsb" \
                 -e YARD_IMG_ARCH=${YARD_IMG_ARCH} \
                 -vvv -i inventory.ini build_yardstick_image.yml
        if [ ! -f "${QCOW_NSB_IMAGE}" ]; then
            echo "Failed building QCOW NSB image"
            exit 1
        fi
    fi

    For this release we won't be able to get DPDK images to compile on ARM, we should fix this conditional and not try to compile.

    Also change the shell glob to match *[_-]ovs_dpdk[_-]* to only enable DPDK
    images for ovs_dpdk scenarios

    JIRA: YARDSTICK-1124

    Change-Id: I03142e6b8aa00dc9cdf9b446868fb723cd10198b
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    (cherry picked from commit 50154694f8dc37726d456cfb8efddc6d3e126dbd)