Konstantin Pelykh

Add support for passing environment variables to Cassandra process

1

I was looking for a way to pass ENV variable to Cassandra process, similar to EXECUTOR_ARG, however executor only passes JMX_PORT as a env variable to the process. https://github.com/mesosphere/dcos-cassandra-service/blob/b407b9bc71870cf2c7d8d4b3c37dc5302154d2df/cassandra-executor/src/main/java/com/mesosphere/dcos/cassandra/executor/CassandraDaemonProcess.java#L254 Is...