Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes stale undercloud delorean repos"
  - Fixes stale undercloud delorean repos

    When we build artifacts for release, we try to freeze the disk images
    and artifacts we use for deployment.  This includes the delorean repo
    which provides OpenStack packages.  This repo however expires after a
    couple months and then if any packages were missing in the Undercloud
    released artifact, they will attempt to be downloaded during install
    and fail.

    This patch adds some logic to detect if there is internet connectivity,
    and if so then download and update the delorean repo on the undercloud.

    JIRA: APEX-565

    Change-Id: I58c28437fb5c5b179033c939377fd97aefbf427c
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 5443898..a4f70cb 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 5443898e7a1927d8e3cd35e70e3872ed5d9a6d97
+Subproject commit a4f70cb1db40eac845c2df17158e77163c887ff1