Added debugging to determine actual interruption exception.
Added debugging to determine actual interruption exception.

- InterruptedException catch block is not being triggered on
  manual cancellation of jenkins build

dcos/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,dcos/dcos-cli