Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - committer nomination for Yibo Cai

    Hi committers, I propose to nominate Yibo as a committer of Compass4nfv.
    Yibo did a great work in supporting Kubernetes running on ARM64 servers and
    Kubernetes scenarios integration in Fraser release.
    More detailed contributions are listed:
    https://gerrit.opnfv.org/gerrit/#/q/owner:yibo.cai%2540arm.com+status:merged

    Please vote +2 if you agree with Yibo's monination.

    Change-Id: Ie9ed38f9aac2a672e54d8ffac75c8e13eaf27871
    Signed-off-by: chigang <chigang@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index a4836b1..f6975e1 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit a4836b1241cfb26f6d2073e0b5e8467e6019be9b
+Subproject commit f6975e14f59d55d3d0f7518b66ab358e94943c4e