Make the --color=false option, work properly.

Author: andxyz

lib/foreman/engine/cli.rb

@@ -30,7 +30,7 @@ def self.enable(io, force=false)
     end
 
     def color?
-      return true if @@color_force
+      return @@color_force unless @@color_force.nil?
       return false if Foreman.windows?
       return false unless self.respond_to?(:isatty)
       self.isatty && ENV["TERM"]