Add get_hosts and refactor the code.
Fix InstanceID, ImageID to partial-lower case.
Fix left InstanceID, ImageID to partial-lower case.
Merge fix/template-image-id.
Merge feature/generate-host-parameter.
Add resouce 70-persistent-net.rules to correct device names.
Merge fix/remove-persistent-net-line.
Modify to create tmp directory if it dows not exists at the time  parameters.json is created.
Merget fix/create-tmp-dir-if-not-exists.
Change protocol from UDP to TCP