[DRE-maint] Bug#995346: ruby-chef-utils: depends on the Internet during build

[Lucas Kanashiro]

It is trying to access internet because the JSON files for each platform 
family in ruby-fauxhai is outdated. ruby-fauxhai checks if the required 
JSON file is available locally and if it is not it is downloaded from 
Github. The version 7.5.0 of ruby-fauxhai seems to have all the needed 
files in it and would fix this ruby-chef-utils build issue.

-- 
Lucas Kanashiro