desi_queue_status

[sbailey]

This PR adds a new script desi_queue_status for summarizing jobs in the queue and recent history; this is useful for monitoring during a production run. Currently it tracks SUCCESS, FAILED, and TIMEOUT jobs, but not CANCELLED (e.g. cancelled due to a dependency failing). It could be better, but it is useful as-is and I'd like to get it into the next tag, and then continue improvements in future PRs (like adding CANCELLED once I figure out how to get sacct to report those too without already knowing the job IDs).

Example output, running as sjbailey but checking the desi queue for jobs from yesterday+today (default is today only, but we haven't run much today to be interesting):

[login08 desispec] desi_queue_status -u desi -S 2023-01-26
Fri Jan 27 15:50:36 2023
0 jobs running, 0 pending, and 0 waiting on dependencies
Recent job completion history:
     HOUR     COMPLETED FAILED TIMEOUT
------------- --------- ------ -------
2023-01-26T08       102     33       1
2023-01-26T09       659      1       0
2023-01-26T10       696      1       1
2023-01-26T11        28      1       0
2023-01-26T12        19      0       1
2023-01-26T13         5      0       0
2023-01-26T21         3      0       0
2023-01-27T15         1      0       0