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(cherry picked from commit 74c3b9d3)

(cherry picked from commit 1734f1b3)

- use RADIX_V4, RADIX_V6, RADIX_V4_ECS, and RADIX_V6_ECS as array
  indices instead of 0 through 3.
- remove some unused macros

(cherry picked from commit f7f20b12)

Resolve "add cfg_parse_buffer4"

Closes #325

See merge request !353

(cherry picked from commit b313084a)

Resolve "option to disable responding with cookies [ISC-Support #12614]"

See merge request !154

(cherry picked from commit 5f7a6232)

(cherry picked from commit b5265a8c)

(cherry picked from commit a5933fa2)

(cherry picked from commit 29305073)

Resolve "add support for marking options as deprecated."

Closes #322

See merge request !351

(cherry picked from commit befff945)

Don't fetch DNSKEY when fuzzing resolver

See merge request !347

(cherry picked from commit cb3208aa)

Merge branch '240-multiple-rrsigs-on-some-records-in-signed-zone-even-though-only-one-key-is-ever-active-at-a-time-v9_12-v9_11' into 'v9_11'

Resolve "Multiple RRSIGs on some records in signed zone even though only one key is ever active at a time"

Closes #240

See merge request !231

(cherry picked from commit ba7a3431)
(cherry picked from commit 00f1956c)

(cherry picked from commit 0db5b087)
(cherry picked from commit 1783fa5a)

(cherry picked from commit 87a3dc8a)
(cherry picked from commit 69340b5a)

only sign with other keys when deleting a key if there are not already existing signature for the deleted algorithm

(cherry picked from commit 0667bf7a)
(cherry picked from commit c1e342ce)

Resolve "move named -T processing to its own function"

Closes #316

See merge request !343

(cherry picked from commit ef7401e4)

(cherry picked from commit b491ceeb)

Resolve "ifconfig.sh doesn't work on centos7"

Closes #302

See merge request !330

(cherry picked from commit 71f2335f)
(cherry picked from commit 7f16672a)

(cherry picked from commit d7c54007)
(cherry picked from commit 3e1a0c2b)

(cherry picked from commit 41b29a43)
(cherry picked from commit e4487b16)

Resolve "check-changes needs to be called for v9_11"

See merge request !337

Backport root-key-sentinel

See merge request !334

(cherry picked from commit 2845d716)
(cherry picked from commit af267c4d)

(cherry picked from commit e20790c9)
(cherry picked from commit edb761b0)

(cherry picked from commit a23b305e)
(cherry picked from commit b9e6b124)

(cherry picked from commit 68e9315c)
(cherry picked from commit ee763ef2)

(cherry picked from commit 8fc9f64d)
(cherry picked from commit 7111eff8)