Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Enables trunk ports with bgpvpn scenario

    This is enabled in regular ODL deployments but is missing from the
    bgpvpn scenario.  Trunk ports are requested by SDNVPN team for testing
    with bgpvpn.

    apex-tripleo-heat-templates: I1b4d3eea61e29e1ede0e06d78fde842ef13b7b8e

    Change-Id: I00a36b56045fa1114d8407fe5005128c46ecefb4
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index f867d21..2f43d91 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit f867d216c135c30d3c86a28bf52495639ff4e890
+Subproject commit 2f43d91a340fa002ea1f03931f5209a616a11a37