Retired BoxGrinder plugin packages

[Marek Goldmann]

Hi,

I just retired following packages:

* rubygem-boxgrinder-build-ebs-delivery-plugin
* rubygem-boxgrinder-build-ec2-platform-plugin
* rubygem-boxgrinder-build-fedora-os-plugin
* rubygem-boxgrinder-build-local-delivery-plugin
* rubygem-boxgrinder-build-rpm-based-os-plugin
* rubygem-boxgrinder-build-s3-delivery-plugin
* rubygem-boxgrinder-build-sftp-delivery-plugin
* rubygem-boxgrinder-build-vmware-platform-plugin

Content of these packages was merged into rubygem-boxgrinder-build to reflect upstream
changes.

--Marek