Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Adds OS_REGION_NAME into overcloudrc files"
  - Adds OS_REGION_NAME into overcloudrc files

    Although this is not required to be able to access overcloud, it is
    required by some tests in Functest.

    JIRA: APEX-570

    Change-Id: I45deaa8061f1be44ce80eed4810537eaf6841803
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 67e7b3c..b83b80e 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 67e7b3c76402445d7e62d5953d661794ec1f7c6d
+Subproject commit b83b80ebb8b1419d8fa39554fedbddfc92039b3c