Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - Fixes ODL config to step 1 only

    opnfv-puppet-tripleo-pr: 30

    JIRA: APEX-473

    Change-Id: I96dbe8c467db6b72df6d82e3575567a6c4d4da70
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 630e952..9d3f55f 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 630e952d359d55394007ba6b957325d1614c2599
+Subproject commit 9d3f55f994988e1443e7d3316045238595730d1d