[systemd-devel] Print a note about reset-failed if start limit is exceeded

[Vaclav Pavlin]

Could you please check this patch, I am not sure about overall JobResult usage. I added one type of result to distinguish fail in favor of start limit from other reasons. But I am not completely sure if there could be a case where JOB_FAILED is awaited, but JOB_FAILED_LIMIT would be passed instead and systemd will not be able to handle it correctly.