Cassandra 3 Upgrade

Move workflow to use SDC cassandra 3
Issue-ID: SDC-2595

Signed-off-by: shrek2000 <oren.kleks@amdocs.com>
Change-Id: I3e0a47c514525e684cf291269a35b9511920eec6
diff --git a/docker-compose/cassandra.yml b/docker-compose/cassandra.yml
index 251b4c9..28d681e 100644
--- a/docker-compose/cassandra.yml
+++ b/docker-compose/cassandra.yml
@@ -2,4 +2,4 @@
 services:
 
   cassandra:
-    image: "cassandra:2.1"
+    image: "cassandra:3.11.4"