add dockerfile for cosmos CI (adding java)
add dockerfile for cosmos CI (adding java)

sis-tools/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,sis-tools/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,mesosphere/dcos-cli,mesosphere/dcos-cli,kensipe/dcos-cli,mesosphere/dcos-cli,kensipe/dcos-cli,sis-tools/dcos-cli