Imports github.com/mitchellh/packer/packer github.com/mitchellh/packer/common/ssh github.com/mitchellh/packer/communicator/ssh github.com/mitchellh/packer/template/interpolate github.com/mitchellh/packer/communicator/winrm github.com/mitchellh/multistep Standard library imports errors fmt io/ioutil log net os strings testing time encoding/pem