Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Adding unittests for apex/deploy.py

    Change-Id: Id108039dcf5d846affe2900706097049b3308e81
    Signed-off-by: Dan Radez <dradez@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index d158a48..37155cf 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit d158a48f4f10e9abb1403b1178b8c2f31b36e992
+Subproject commit 37155cf6521e7cf7cb2d61a269f3a9992fa0a6c0