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remove isc_task and related APIs

The isc_loop, isc_async and isc_job APIs can now do everything isc_task and isc_event used to, and in fact the latter is just a shim around the former. Let's convert everything that still uses isc_task to use loop instead:

  • zone.c (zonemgr_getio() and the dns_io API, key refresh queries, synchronizing inline signing zones, nsec3param updates, xfrin quota, etc)
  • isc_ratelimiter
  • libdns modules: dns_request, dns_validator, dns_adb
  • dnssec-signzone
  • UPDATE processing
  • plugin, dyndb, and dns_client callbacks
  • TAT queries
  • dns_resolver
  • dns_catz and rndc addzone/delzone
  • final isc_task API cleanup
Edited by Evan Hunt
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