Resolve "Omnibus Builder does not work with Chef 13"

Closes #8 (closed).

supports is now deprecated for LinuxUser:

https://github.com/chef/chef/blob/7c84993e32e97918e833883721bbd3138a0e72f8/spec/unit/provider/user/linux_spec.rb#L48

Changing supports manage_home: true to manage_home true in the omnibus-build.rb recipe fixes the issue.