Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Adding support for containerized undercloud"
  - Adding support for containerized undercloud

    Master code only supports containerized undercloud now, so this
    migration is needed.
      - Containerized services in undercloud

    We can still apply patches to THT and other non-docker services, but
    we will need to add support for patching openstack services on
    undercloud.

    Change-Id: I1ca4c6108f144efef7b5889503af265ef0fff8b2
    Signed-off-by: Ricardo Noriega <rnoriega@redhat.com>
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 0a78f21..e1c1254 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 0a78f21e06900fdacc51087c8c764027b750a95f
+Subproject commit e1c125496077fe9b693c80ad0ab9e345f1d2f438