DNS SRV lookups ignore search path

Suggested Release Note

DNS SRV lookups now honor the DNS search path. This enables DNS SRV resolution in Kubernetes environments where the `*-srv` hostname advertised by the Couchbase Operator is a partial name that must be resolved using a suffix from the DNS search path.

The SDK uses JNDI for DNS SRV lookups. Due to a bug in the JNDI DNS implementation, the DNS search path is ignored. This causes problems in some Kubernetes environments, where the *-srv hostname advertised by the Couchbase Operator is a partial name that must be resolved using a suffix from the DNS search path.

The `dnsjava` library honors the search path, so we could use it for all out DNS SRV lookups.

Task: Add dnsjava to core-io-deps, and use it for DNS SRV lookups.