Some of the statschannel system test cases fail if I build BIND 9.16.9

Summary

Some of the statschannel system test cases fail if I build BIND 9.16.9 --without-libmlx2 and with pytest as follows:

D:statschannel:FAILED tests-xml.py::test_zone_timers_primary_xml - assert 404 == 200
D:statschannel:FAILED tests-xml.py::test_zone_timers_secondary_xml - assert 404 == 200
D:statschannel:FAILED tests-xml.py::test_zone_with_many_keys_xml - assert 404 == 200
D:statschannel:FAILED tests-xml.py::test_traffic_xml - assert 404 == 200

These tests seem to be run without checking "HAVEXMLSTATS". It is suggest skipping these python tests if "HAVEXMLSTATS" is false, like tests.sh does.

Also suspect the same kind of problem exists for json

BIND version used

9.16.9

See RT #17360