Update cassandra-env.sh template with version of dsc-cassandra 1.1.7
Update cassandra-env.sh template with version of dsc-cassandra 1.1.7

igoraj/puppet-cassandra,varunarya10/puppet-cassandra,3fs/puppet-cassandra,sigmunau/puppet-cassandra,varunarya10/puppet-cassandra,msimonin/puppet-cassandra,wywygmbh/puppet-cassandra,serenakeating/21puppet-cassandra,wywygmbh/puppet-cassandra,varunarya10/puppet-cassandra,igoraj/puppet-cassandra,3fs/puppet-cassandra,3fs/puppet-cassandra,sigmunau/puppet-cassandra,igoraj/puppet-cassandra,msimonin/puppet-cassandra,sigmunau/puppet-cassandra,gini/puppet-cassandra,wywygmbh/puppet-cassandra,serenakeating/21puppet-cassandra