Merge pull request ManageIQ#201 from jrafanie/start_drb_server_with_u…

…nix_socket

Start the drb server with a unix socket
(cherry picked from commit 06af67f5fb365d411f549bea4d8c7a58b4f76926)

https://bugzilla.redhat.com/show_bug.cgi?id=1603578

lib/miq_automation_engine/engine/miq_ae_engine/drb_remote_invoker.rb

@@ -38,7 +38,12 @@ def setup
       require 'drb/timeridconv'
       global_id_conv = DRb::TimerIdConv.new(drb_cache_timeout)
       drb_front = MiqAeMethodService::MiqAeServiceFront.new(@workspace)
-      self.drb_server = DRb::DRbServer.new("druby://127.0.0.1:0", drb_front, :idconv => global_id_conv)
+
+      require 'tmpdir'
+      Dir::Tmpname.create("automation_engine", nil) do |path|
+        self.drb_server = DRb.start_service("drbunix://#{path}", drb_front, :idconv => global_id_conv)
+        FileUtils.chmod(0o750, path)
+      end
     end
 
     def teardown