rem: usr: Remove randomized RRset ordering

The rrset-order random doesn't offer uniform distribution of all
permutations and it isn't superior to cyclic order in any way.  Make the
random ordering an alias to the cyclic ordering.

Closes: #5513
Merge branch 'ondrej/remove-rrset-order-random' into 'main'

See merge request isc-projects/bind9!10912