website: Add group_vars and host_vars to Ansible provisioner docs

(configs to disable will come next)

Config Dir and plugin discovery there

Merge branch '1064-fix-upload-file-permissions' of github.com:rasa/packer into rasa-1064-fix-upload-file-permissions

Conflicts:
	builder/parallels/common/step_upload_parallels_tools.go
	builder/vmware/common/step_upload_tools.go
	provisioner/chef-client/provisioner.go
	provisioner/chef-solo/provisioner.go

post-processor/compress Add support for artifact compression.

parallels-iso: allow absolute output directory.

Fixes [GH-1466]

Add the cleanup when the process of EBS AMI interrupted