Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Merge "Disable introspection extras" into stable/euphrates
  - Disable introspection extras

    According to the documentation introspection extras attempts to collect
    more hardware info during inspection.  This is causing problems for some
    users and we do not need it for our deployments.

    JIRA: APEX-534

    Change-Id: Ia4a72ed14fb744a10d02ee2d3f4e283cc7208c2b
    Signed-off-by: Tim Rozet <trozet@redhat.com>
    (cherry picked from commit a9051056309f8a8b51b4533d67525efc790587b4)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index c4e60fb..f15d50c 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit c4e60fbca8cefc5c81d221c4faa55fed09f5e70c
+Subproject commit f15d50c2009f1f865ac6f4171347940313727547