Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Moving undercloud root pw to debug only

    Change-Id: I380d39b6c78519487dec3b053c53a9579df57f06
    Signed-off-by: Dan Radez <dradez@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 1d65553..035c80d 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 1d655538cfe9a665c5e12dc8b910ddaaae21bae7
+Subproject commit 035c80d52a780125ba84d1bc5f8232c9ff2a4a17