added docker repo

roles/cassandra/templates/cassandra.service

@@ -13,7 +13,7 @@ ExecStart=/usr/bin/docker run --name %n -v /srv/lib/cassandra:/var/lib/cassandra
  -p 7000:7000 -p 7001:7001 -p 7199:7199 -p 9042:9042 -p 9160:9160 \
  -e CASSANDRA_BROADCAST_ADDRESS={{ansible_default_ipv4.address}} \
  -e CASSANDRA_START_RPC=True \
- {{run_options}} cassandra:3.10
+ cassandra:3.10
 
 [Install]
 WantedBy=multi-user.target