fixes #6334 - pass virsh_network to virsh DNS provider
fixes #6341 - Add support for 64-bit MAC addresses
fixes #6436: plugins are now being loaded after core modules
fixes #6306: removed possible namespace collisions with puppet and chef
fixes #6474: smart-proxy relies on Bundler to load sinatra dependency
fixes #6289: avoids concurrent downloads of files with the same name and destination dir.