3514. [bug] The ranges for valid key sizes in ddns-confgen and
rndc-confgen were too constrained. Keys up to 512
bits are now allowed for most algorithms, and up
to 1024 bits for hmac-sha384 and hmac-sha512.
[RT #32753]
(cherry picked from commit 33b8db1bb3)
(cherry picked from commit db3792f241)