bump Cassandra version to 1.2.16 (from 1.2.15)

- fixes https://issues.apache.org/jira/browse/CASSANDRA-6685
diff --git a/software/nosql/src/main/java/brooklyn/entity/nosql/cassandra/CassandraNode.java b/software/nosql/src/main/java/brooklyn/entity/nosql/cassandra/CassandraNode.java
index dac51e2..86b6b02 100644
--- a/software/nosql/src/main/java/brooklyn/entity/nosql/cassandra/CassandraNode.java
+++ b/software/nosql/src/main/java/brooklyn/entity/nosql/cassandra/CassandraNode.java
@@ -31,7 +31,7 @@
 public interface CassandraNode extends DatastoreMixins.DatastoreCommon, SoftwareProcess, UsesJmx, UsesJavaMXBeans, DatastoreMixins.HasDatastoreUrl, DatastoreMixins.CanExecuteScript {
 
     @SetFromFlag("version")
-    ConfigKey<String> SUGGESTED_VERSION = ConfigKeys.newConfigKeyWithDefault(SoftwareProcess.SUGGESTED_VERSION, "1.2.15");
+    ConfigKey<String> SUGGESTED_VERSION = ConfigKeys.newConfigKeyWithDefault(SoftwareProcess.SUGGESTED_VERSION, "1.2.16");
     // when this changes remember to put a copy under releng2:/var/www/developer/brooklyn/repository/ !
     // TODO experiment with supporting 2.0.x