Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Updates to development dependency script

    - Removing easy install references
    - adding gitpython to pip installs

    Change-Id: I8a07749d6444b63304cb5eabbf8d021eeb2fcd33
    Signed-off-by: Dan Radez <dradez@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 1f346dd..ff9beeb 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 1f346dd0052a8a24309a55058c54299803d95e09
+Subproject commit ff9beeb45e7d25aedf2d25644497b0468a96ee16