Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes removing inventory keys"
  - Fixes removing inventory keys

    Inventory keys that we want to delete were not being removed for
    instackenv.json.  Also fixes unit tests.

    Change-Id: I7d6c752342db050d651953633f18e236f60334e3
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index fbc49a7..e0fcaab 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit fbc49a7d84eefbecb2ef9774bae99d30e66a52be
+Subproject commit e0fcaab6ea8b32277152b69848568d7cbb50c1d6