use a forked process to exec a run with environment

lib/foreman/cli.rb

@@ -75,15 +75,18 @@ class Foreman::CLI < Thor
 
   def run(*args)
     load_environment!
+    pid = fork do
       begin
-      process = Foreman::Process.new(args.shelljoin, :env => engine.env)
+        engine.env.each { |k,v| ENV[k] = v }
-      process.run
+        exec args.shelljoin
       rescue Errno::EACCES
         error "not executable: #{args.first}"
       rescue Errno::ENOENT
         error "command not found: #{args.first}"
       end
     end
+    Process.wait(pid)
+  end
 
   desc "version", "Display Foreman gem version"