Skip SASL_SSL-Functional check in DC/OS < 1.12 (#443)
Skip SASL_SSL-Functional check in DC/OS < 1.12 (#443)

* Skip SASL_SSL-Functional check in DC/OS < 1.12

* Fixed flake8 errors

mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service,mesosphere/dcos-kafka-service