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>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 37db53e..7afdbb1 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 37db53e73201a46d673a5a52844a8c5d640b9403
+Subproject commit 7afdbb1351729dffa7d4bba7a2c505ef707d10c9