Update git submodules

* Update docs/submodules/apex from branch 'stable/fraser'
  - Fixing os-odl-sfc scenario

      We need to build again OVS2.6 and apply yyang
      patches.

    apex-tripleo-heat-templates: I230b31dc9ed0ecc5046064628ba2f2505e589522
    apex-puppet-tripleo: Icd433ddc6ae7de19a09f9e33b410a362c317138a
    Change-Id: Ia61216f6bd23ecaaa87b151452268c8ca04dc193
    Signed-off-by: Ricardo Noriega <rnoriega@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 870c664..f8fd162 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 870c66456c3e4d600a880df5b3612e5002fd9922
+Subproject commit f8fd162ac74c83cd972311ee152b09bad6312999