Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Fix install failures for python-etcd and puppet-etc

    Delorean repo used in frozen images has expired, so need to
    pull from latest Ocata repo.

    JIRA: APEX-542

    Change-Id: I2e3e16687b9ca389ecaf83ca48dddf4d4a161357
    Signed-off-by: Tim Rozet <trozet@redhat.com>
    (cherry picked from commit e1c2217d0310a3fec511f34b36e8391aa83eac01)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 195d18e..f9cdd78 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 195d18eb89e17823eafc24950aafc9d510903c27
+Subproject commit f9cdd787b22a286daebecb14532b437939687c5e