Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Fix zrpcd start in the controller node

    Add sudo into zrpcd process start command
    Add starting script into /etc/rc.d/rc.local too

    Change-Id: I3c724ff60d4c3feb7379b1a8bbeca8a928cfe81b
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit 577ccdd1e7ce654ebc7479d8bd1e232abb922571)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 44bafd3..2ca3819 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 44bafd3a55c92920678687dbb3a9c015961649d6
+Subproject commit 2ca38198dbc25c651f007c6f478ca604bbdee56d