Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 52853025e3b450957fa3813cb4e9861f3573510a
  - Merge "Make aio.sh rerunnable"
  - Make aio.sh rerunnable

    aio.sh script can be run only ones.
    Cloning of k8s on top of existing dir does not work
    and ssh key generation on top of existing key does not work.

    Issue-ID: MULTICLOUD-620

    Change-Id: Ic60dfd6b96ab78f6edcdc3655c18f90c4427c856
    Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>

diff --git a/docs/submodules/multicloud/k8s.git b/docs/submodules/multicloud/k8s.git
index 1f78517..5285302 160000 (submodule)
--- a/docs/submodules/multicloud/k8s.git
+++ b/docs/submodules/multicloud/k8s.git
@@ -1 +1 @@
-Subproject commit 1f78517c7ef99edb60ff1196f640bcaeddaa6f0a
+Subproject commit 52853025e3b450957fa3813cb4e9861f3573510a