[omnibus] Use latest chef and ruby from omnibus-software
[omnibus] Use latest chef and ruby from omnibus-software

Signed-off-by: Steven Danna <9ce5770b3bb4b2a1d59be2d97e34379cd192299f@chef.io>

chef/opscode-pushy-server,chef/opscode-pushy-server,chef/opscode-pushy-server