Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Fixes log location for pyutils

    Change-Id: I03cda65f58753fc5d55ea4ede78f7d5bd8b7bdce
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 382fa45..4d537d8 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 382fa452e0c9a8189911f615416e1b24badaf5e4
+Subproject commit 4d537d8b9edf67057cc28656583bbfb7dd489779