mdns: improve nic-ip changelog

if a NIC is brought up with several IPs,
it would only mention one of the new IPs in the logs

or if a PCIe bus crashes and all NICs drop dead,
it would only mention one of the IPs that disappeared

as both scenarios are oddly common, be more verbose

copyparty/tcpsrv.py

@@ -402,17 +402,17 @@ def netmon(self):
             if not netdevs:
                 continue
 
-            added = "nothing"
-            removed = "nothing"
+            add = []
+            rem = []
             for k, v in netdevs.items():
                 if k not in self.netdevs:
-                    added = "{} = {}".format(k, v)
+                    add.append("\n  added %s = %s" % (k, v))
             for k, v in self.netdevs.items():
                 if k not in netdevs:
-                    removed = "{} = {}".format(k, v)
+                    rem.append("\nremoved %s = %s" % (k, v))
 
-            t = "network change detected:\n  added {}\033[0;33m\nremoved {}"
-            self.log("tcpsrv", t.format(added, removed), 3)
+            t = "network change detected:\033[32m%s\033[33m%s"
+            self.log("tcpsrv", t % ("".join(add), "".join(rem)), 3)
             self.netdevs = netdevs
             self._distribute_netdevs()