Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Adds IP to external network NIC on computes

    Deployments now fail in baremetal because the external NTP server cannot
    be reached because there is no IP on the extenal interfaces for
    computes.

    Change-Id: Ic1e67072b81bb7ca4e15930840dc77d27913737f
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index d6af6ae..a3fd284 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit d6af6ae3c5a38e752a8df664b1d5aa3d49d1fa57
+Subproject commit a3fd284d7253b8e09fa87bf98bcaae7d1e42ea3f