add keyusage test

...ta/keys/keys/712d0d0d57fa0aa006b5e20cd84e23941e5f3ab2.pem

...ta/keys/keys/7a3500c7feac3fd99f09a208a83b97f7455fa3e0.pem

...ta/keys/keys/f3b8db9d60fb412d0363dd0c0ac2ea72dc212777.pem

tests-extra/tests/dnssec/keyusage/data/keys/keyusage.json

...tra/tests/dnssec/keyusage/data/keys/zone_example.com.json

...s-extra/tests/dnssec/keyusage/data/keys/zone_records.json

tests-extra/tests/dnssec/keyusage/test.py

tests-extra/tools/dnstest/server.py