Updated git submodules

Project: aaa master 9d4ad3c16f3e7abec2ecc2808daec12b3844f76b

Remove cassandra based store

This is dead code, since there appears to be no way to configure cassandra as
the default backing data store.  Thus, the code exists, but is never instantiated.

Even the feature "odl-aaa-cassandra*" does not properly load the cassandra based
backing data store.

Since the feature doesn't appear to work or add anything extra, it is being removed.
We are providing an alternative dropin backed by mdsal instead, which should
be used instead.

Change-Id: I30c5231753544b170fb05bb461734cbc34efec8a
Signed-off-by: Ryan Goulding <ryandgoulding@gmail.com>

diff --git a/docs/submodules/aaa b/docs/submodules/aaa
index 5e9e0c520fca4e6643a985aa72c81d3b1e47d167..9d4ad3c16f3e7abec2ecc2808daec12b3844f76b 160000 (submodule)
--- a/docs/submodules/aaa
+++ b/docs/submodules/aaa
@@ -1 +1 @@
-Subproject commit 5e9e0c520fca4e6643a985aa72c81d3b1e47d167
+Subproject commit 9d4ad3c16f3e7abec2ecc2808daec12b3844f76b