Merged in bmand/container-image-support (pull request #7)

bluegreen container image support

* Add bluegreen-container-stressor image
Add image-oci from meta-virtualization (mickledore) to create image compatible with oci tar format

* Add bluegreen-container-image

* Add container-image-loader used to import container in docker store at boot


Approved-by: Alain Bareille