Replace random port selection in MinIO and JMX test helpers with fixed
ports on unique per-test loopback IPs, eliminating TOCTOU races.
Commits:
- kmip_wrapper: default hostname to 127.0.0.1
- nodetool: bind JMX to the per-module loopback IP with fixed port 7199
- minio: use fixed service and console ports on a unique HostRegistry IP
instead of probing the ephemeral range; raise on start failure
Fixes: SCYLLADB-1817
Minor improvement, no need to backport.
Closesscylladb/scylladb#29741
* github.com:scylladb/scylladb:
test/pylib: use fixed MinIO ports on unique loopback IPs
test/nodetool: bind JMX to per-module loopback IP
test/pylib: default KMIP wrapper to loopback