TlsGuardingConnection doesn't do a TLS handshake on reused connections

With Oak 1.22.6, org.apache.directory.api.api-all received a major version update. With the previous version, the method LdapNetworkConnection#startTls() failed when called more than once on the same connection. As a workaround we used the derived class TlsGuardingConnection which prevented this. With the new version, not only LdapNetworkConnection#startTls() may be called multiple times, but also has to be called when a connection from the pool is reused. TlsGuardingConnection doesn't do this, which results in insecure connections.