bzfs_jobrunner - use a single shared jobconfig file to periodically create ZFS snapshots, replicate and prune, across source host and multiple destination hosts

[whoschek]

This v1.10.0 release contains some fixes and a lot of new features, including ...

• Improved compat with rsync.net.
• Added daemon support for periodic activities every N milliseconds, including for taking snapshots, replicating and pruning.
• Added the bzfs_jobrunner companion program, which is a convenience wrapper around bzfs that simplifies periodically creating ZFS snapshots, replicating and pruning, across source host and multiple destination hosts, using a single shared jobconfig script.
• Added --create-src-snapshots-* CLI options for efficiently creating periodic (and adhoc) atomic snapshots of datasets, including recursive snapshots.
• Added --delete-dst-snapshots-except-plan CLI option to specify retention periods like sanoid, and prune snapshots accordingly.
• Added --delete-dst-snapshots-except CLI flag to specify which snapshots to retain instead of which snapshots to delete.
• Added --include-snapshot-plan CLI option to specify which periods to replicate.
• Added --new-snapshot-filter-group CLI option, which starts a new snapshot filter group containing separate --{include|exclude}-snapshot-* filter options, which are UNIONized.
• Added anytime and notime keywords to --include-snapshot-times-and-ranks.
• Added all except keyword to --include-snapshot-times-and-ranks, as a more user-friendly filter syntax to say "include all snapshots except the oldest N (or latest N) snapshots".
• Log pv transfer stats even for tiny snapshots.
• Perf: Delete bookmarks in parallel.
• Perf: Use CPU cores more efficiently when creating snapshots (in parallel) and when deleting bookmarks (in parallel) and on --delete-empty-dst-datasets (in parallel)
• Perf/latency: no need to set up a dedicated TCP connection if no parallel replication is possible.
• For more clarity, renamed --force-hard to --force-destroy-dependents. --force-hard will continue to work as-is for now, in deprecated status, but the old name will be completely removed in a future release.
• Use case-sensitive sort order instead of case-insensitive sort order throughout.
• Use hostname without domain name within --exclude-dataset-property.
• For better replication performance, changed the default of bzfs_no_force_convert_I_to_i form false to true.
• Fixed "Too many arguments" error when deleting thousands of snapshots in the same 'zfs destroy' CLI invocation.
• Make 'zfs rollback' work even if the previous 'zfs receive -s' was interrupted.
• Skip partial or bad 'pv' log file lines when calculating stats.
• For the full list of changes, see the https://github.com/whoschek/bzfs