Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Add support for kubernetes deployment"
  - Add support for kubernetes deployment

    This patch adds capability to deploy kubernetes cluster instead of openstack.
    Kubernetes will be deployed using kubespray and is run after TripleO bookstraps
    overcloud nodes.

    JIRA: APEX-574

    Change-Id: If9c171620c933a052b719e7112a50e22bbab667f
    Signed-off-by: Feng Pan <fpan@redhat.com>
    Signed-off-by: Zenghui Shi <zshi@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 320cbf7..b5e2f1f 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 320cbf7d8b69fefb467b85a713c791f6a29b662a
+Subproject commit b5e2f1f65dee0cd692fe275d6bce69a8e410cac3