Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes BgpVpn service name and tht fixes"
  - Fixes BgpVpn service name and tht fixes

    BgpVpn service was spelled incorrectly and there were syntax issues with
    the corresponding heat templates.

    apex-tripleo-heat-templates: If39072c687dcfb3fcb5c2dab33ecc3755b3396df

    Change-Id: I94155f4a32af2338bcd58afe3fb602860346a555
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 27cdc93..7af8cf0 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 27cdc93d181edfa6fb1dc4c4592145a075e240b9
+Subproject commit 7af8cf039ef21da528a8cb53e0eb78c1b6878714