Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Add support for interface role mapping for odl_l3-fdio scenarios"
  - Add support for interface role mapping for odl_l3-fdio scenarios

    JIRA: APEX-445
    opnfv-puppet-tripleo-pr: 24

    Change-Id: Idbb855badae2f2b91202961c12931ba54be1beaa
    Signed-off-by: Feng Pan <fpan@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index fcd5a75..d2c1530 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit fcd5a75810ed9167baf6e5da4ab20b59f7ab1de4
+Subproject commit d2c15307b89e5229df783bb25a099d0580197cc2