Update git submodules

* Update docs/submodules/apex from branch 'stable/fraser'
  - Fixes ctlplane default route

    Default route was using the undercloud IP, and instead should be using
    the gateway set for the network in network settings.

    JIRA: APEX-597

    Change-Id: Iff6b18a6553af98cf9da72c278f358922d489958
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 0b57899..c5bafa1 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 0b5789905915f0468d18aa3c42eb469a331e8315
+Subproject commit c5bafa166da6681c96a3c0d0e4b869621d52efd4