(maint) Add packaging data files

This commit adds the data files that drive packaging to ext. This includes
project_data.yaml and build_defaults.yaml.
(maint) Add packaging artifacts for debian and redhat

This commit adds packaging artifacts for debian and redhat. This will allow the
plugin to be built using our standard toolset. The artifacts have been written
so that the packages behave equally to the currently produced
mcollective-pluginpackager packages.