Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 57bfaca23061383d21bab87a91ac0202261b0a26
  - Update docker version
    
    Change docker version to fix kubespray issue
    
    Signed-off-by: Ritu Sood <ritu.sood@intel.com>
    Issue-ID: MULTICLOUD-1073
    Change-Id: I79571677f81efbb12a963b7527d918eddaf8db1f
    
diff --git a/docs/submodules/multicloud/k8s.git b/docs/submodules/multicloud/k8s.git
index dbc92ba..57bfaca 160000
--- a/docs/submodules/multicloud/k8s.git
+++ b/docs/submodules/multicloud/k8s.git
@@ -1 +1 @@
-Subproject commit dbc92bae58ffbeb38f5c3e5c58a1da2fb3b349f4
+Subproject commit 57bfaca23061383d21bab87a91ac0202261b0a26