Gittrac #3532:  Disabled the total node time code, because it doesn't
deal correctly with noop nodes.
Gittrac #3532:  Made the job_dagman_metrics-A test semi-functional.
Gittrac #3532:  We don't try to report metrics on Windows; various
other cleanups of the code.
Gittrac #3532:  Turned sending of total_job_time back on (always
0 for now).