Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Adds parser tests and cleanup"
  - Adds parser tests and cleanup

    Adds unit testing for the common/parsers library and cleans up some of
    the test files syntax.

    Change-Id: I7ff9d7ba20b028fba410af900a0c3107a5806d8f
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 0cedf1d..ec13bb9 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 0cedf1dc636d2532eb818dd88c19106199500ac7
+Subproject commit ec13bb94237f2157fa1e1037a0a9f7c4c4e09e39