Remove downloaded plugins after installation
Remove downloaded plugins after installation

Currently we only remove the temporary staging dir, we should also
remove ZIP artifacts from the temp folder.

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