fix rfc4193 related integration test failures

re issue #209

they would fail _sometimes_
so far so good with this change

this change inserts
fd23:3cca:ac27:8e85:c199:9300::/88

instead of
fd23:3cca:ac27:8e85:c199:93e7:50c5:1646/88

into the reverse ptr authority

actually, maybe to_ptr_soa_name should do this

The real app init() does a similar thing, so
we'll need to address that too. Not sure if this the
correct fix yet.

tests/service/mod.rs

@@ -177,11 +177,14 @@ impl Service {
             let socket_addr = SocketAddr::new(listen_ip.clone(), 53);
             listen_ips.push(socket_addr);
             let cidr = IpNetwork::from_str(&cidr.clone()).unwrap();
+            let cidr = IpNetwork::new(cidr.network(), cidr.prefix()).unwrap();
+
             if !ipmap.contains_key(&listen_ip) {
                 ipmap.insert(listen_ip, cidr.network());
             }
 
             if !authority_map.contains_key(&cidr) {
+                let cidr = IpNetwork::new(cidr.network(), cidr.prefix()).unwrap();
                 let ptr_authority = RecordAuthority::new(
                     cidr.to_ptr_soa_name().unwrap(),
                     cidr.to_ptr_soa_name().unwrap(),
@@ -195,6 +198,7 @@ impl Service {
         if let Some(v6assign) = tn.network.config.clone().unwrap().v6_assign_mode {
             if v6assign.rfc4193.unwrap_or(false) {
                 let cidr = tn.network.clone().rfc4193().unwrap();
+                let cidr = IpNetwork::new(cidr.network(), cidr.prefix()).unwrap();
                 if !authority_map.contains_key(&cidr) {
                     let ptr_authority = RecordAuthority::new(
                         cidr.to_ptr_soa_name().unwrap(),