Land rapid7#8896, Output job id when jobifying exploit

Author: Brent Cook

lib/msf/ui/console/command_dispatcher/exploit.rb

@@ -147,7 +147,7 @@ def cmd_exploit(*args)
     # wonder what's up.
     elsif (jobify)
       if mod.job_id
-        print_status("Exploit running as background job.")
+        print_status("Exploit running as background job #{mod.job_id}.")
       end
     # Worst case, the exploit ran but we got no session, bummer.
     else