Increase version of cassandra distribution

Version 3.0.13 of Cassandra distribution is not available any longer
at the distribution site. Now 3.0.14 is there, therefore we increased
the version in the attributes.

Change-Id: I5a8f7018c2d3466e26b7f27b17eafc75588a8e22

cookbooks/cassandra/attributes/default.rb

@@ -20,10 +20,10 @@
 default['cassandra']['user'] = 'cassandra'
 
 default['cassandra']['tarball'] =
-  'http://www-eu.apache.org/dist/cassandra/3.0.13/'\
-  'apache-cassandra-3.0.13-bin.tar.gz'
+  'http://www-eu.apache.org/dist/cassandra/3.0.14/'\
+  'apache-cassandra-3.0.14-bin.tar.gz'
 default['cassandra']['checksum'] =
-  '2bbc812f54903131ac8c6dd6fc236c9c09825b62f83c480957bdcab371dd8fc3'
+  '0156c1bfc25021b98e9f6ca79e324b393a767fd947ff5825ea99e443b929c1a9'
 
 default['cassandra']['connection_retries'] = 12
 default['cassandra']['connection_sleep_seconds'] = 5