Release candidate 1.9.0rc1. Important changes: - Move scheduled cleanup from `check_arcce_monitor` to `check_arcce_clean`. As a consequence users may want to run `check_arcce_clean` at least once per every hour. - Keep better track of the work done by `check_arcce_monitor` and `check_arcce_clean`. Try to bail out within a slotted time to avoid unclean exits and spurious Nagios alerts. Instead report on the progress and raise a warning or critical alerts if it seems like the probes are not keeping up. - Clean up jobs from the local ARC job file which cannot be queried and which do not correspond to any active job. - The operation of `check_arcce_monitor` can now be restricted to jobs for a certain CE and/or those having been created with a certain `--job-tag`. This should allow running one monitor service per CE and/or job type, though it has not been tested under Nagios. Minor fixes: - Remove execute bit and shebang from `arcce_igtf.py`. - In `check_archostcert` consider certs unusable 2 days before expiration. - Various timeouts have been adjusted or added. - Fix repeated renaming of output directories from `arcget`. - Make random adjustments to rescheduled job times and process rescheduled and monitoring work in random order. - Remove deprecated `--use-jobs-xml` option from `check_arcce_clean` and some other ancient stuff which nobody will notice. - Avoid warning due to unparsed 12 hex-digit lines from `arcstat`. - Various minor fixes.