Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes for snapshots"
  - Fixes for snapshots

    With deploying snapshots with a new ODL, we currently bring down the
    docker container and bring up the tar.gz distro of ODL on the Overcloud
    host itself (not rebuilding/using container). Therefore we need java
    installed so that ODL can run on the host. In the future this may
    change, but it works well and keeps things simple for now.

    Additionally, there was a change upstream to make the opendaylight
    container docker restart policy "unless-stopped" which means it will
    no longer restart automatically when docker is stopped/started.
    Therefore on first snapshot bring up (without the previously mentioned
    ODL reinstallation) the container does not start, and snapshot
    deployment fails. This patch includes a change to the restart policy to
    always restart it.

    Change-Id: Icc712ba147e578a28e371313154ae3190676f0dc
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index a8fdc5d..3af3e7f 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit a8fdc5d15ecf48a4eff2d5c160f62661d37c0f4e
+Subproject commit 3af3e7faee935ed403ea52ba5de4e2b9d9b41178