Plugin that sets date from a Chef-Guard time url.

Hey folks,

We're happily starting to use cloudbase-init with cloudstack, Chef and Chef-Guard ( http://xanzy.io/projects/chef-guard/introduction/overview.html ). We don't want to use the ntp plugin because our chef recipes configure systems to figure out the NTP server to sync with that's in our domain, etc etc.

Hence a small little plugin that can assist with that.