Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - fix loss of group vars definition

    JIRA:-
    TASK [moon : configure moon.conf for moon slave]
    fatal: [host5]: FAILED! => {"failed": true, "msg": "'moon_slave_name' is undefined"}
    https://build.opnfv.org/ci/job/compass-deploy-virtual-daily-master/3311/console

    Change-Id: Ic6211ef7017e0ed794718f1705ba566af370ea49
    Signed-off-by: chigang <chigang@huawei.com>