Update git submodules

* Update docs/submodules/ccsdk/parent.git from branch 'master'
  to ab6a016e0406473f25a6eff7312257ab395208d2
  - Revert "Use preinstalled version of mariadb"

    Preinstalled version of mariadb (1.5.9) does not seem to work
    with embedded tomcat connection pools.  Or rather, using this version
    forces the very ClassNotFoundException we were trying to fix.

    Change-Id: I42ea6620888dd2c0aba896f141bb309ac207d095
    Issue-ID: CCSDK-1445
    Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>

diff --git a/docs/submodules/ccsdk/parent.git b/docs/submodules/ccsdk/parent.git
index bed9588..ab6a016 160000 (submodule)
--- a/docs/submodules/ccsdk/parent.git
+++ b/docs/submodules/ccsdk/parent.git
@@ -1 +1 @@
-Subproject commit bed9588ef11d6b212d3501d1b81ce3a10051a155
+Subproject commit ab6a016e0406473f25a6eff7312257ab395208d2