Changed the default "storage.hostname" value from onos8vpc to "localhost"

Discussed with: Jono
diff --git a/src/main/resources/cassandra.titan b/src/main/resources/cassandra.titan
index 8846963..ef6f3ae 100644
--- a/src/main/resources/cassandra.titan
+++ b/src/main/resources/cassandra.titan
@@ -1,3 +1,3 @@
 storage.backend=cassandra
-storage.hostname=onos8vpc
+storage.hostname=localhost
 storage.keyspace=onos