Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 64f78186cfc27c151b597461d2f3e64bc308ba1b
  - Merge "Add Composite Application API"
  - Add Composite Application API

    Implemented Composite application API and added create,
    get and delete handlers for the composite applications.

    Formatted Project related .go files

    Issue-ID: MULTICLOUD-994
    Signed-off-by: Srivahni Chivukula <srivahni.chivukula@intel.com>
    Change-Id: I7cef1a2c75f8cb39f397dcbb3f5d7bb2a57b4a72

diff --git a/docs/submodules/multicloud/k8s.git b/docs/submodules/multicloud/k8s.git
index e4f7a40..64f7818 160000 (submodule)
--- a/docs/submodules/multicloud/k8s.git
+++ b/docs/submodules/multicloud/k8s.git
@@ -1 +1 @@
-Subproject commit e4f7a40fd862688eebda72826498a5f358341170
+Subproject commit 64f78186cfc27c151b597461d2f3e64bc308ba1b