Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 4fb6acf5a720a0554c08a6f1d3526271b6317cdb
  - Merge "Correct go version installed by k8s addons"
  - Correct go version installed by k8s addons

    Andrewrothstein.go galaxy role, that was responsible for
    go installation was in too old tag to support demanded
    (1.12.4) go version. It also blocked ovn-kubernetes addon
    installation that's fixed now. Go version has been also
    upgraded to 1.12.5

    Issue-ID: MULTICLOUD-644

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: I926bd061a361b2ae2efa2aecedf4fa6321f04cc8

diff --git a/docs/submodules/multicloud/k8s.git b/docs/submodules/multicloud/k8s.git
index d18501a..4fb6acf 160000 (submodule)
--- a/docs/submodules/multicloud/k8s.git
+++ b/docs/submodules/multicloud/k8s.git
@@ -1 +1 @@
-Subproject commit d18501a4c4b15ee99e600ec6a5385616021812b4
+Subproject commit 4fb6acf5a720a0554c08a6f1d3526271b6317cdb