lib/nat: Add a nat package and service to track mappings on multiple IGDs

lib/config/config_test.go

@@ -44,10 +44,10 @@ func TestDefaultValues(t *testing.T) {
 		RelaysEnabled:           true,
 		RelayReconnectIntervalM: 10,
 		StartBrowser:            true,
-		UPnPEnabled:             true,
-		UPnPLeaseM:              60,
-		UPnPRenewalM:            30,
-		UPnPTimeoutS:            10,
+		NATEnabled:              true,
+		NATLeaseM:               60,
+		NATRenewalM:             30,
+		NATTimeoutS:             10,
 		RestartOnWakeup:         true,
 		AutoUpgradeIntervalH:    12,
 		KeepTemporariesH:        24,
@@ -174,10 +174,10 @@ func TestOverriddenValues(t *testing.T) {
 		RelaysEnabled:           false,
 		RelayReconnectIntervalM: 20,
 		StartBrowser:            false,
-		UPnPEnabled:             false,
-		UPnPLeaseM:              90,
-		UPnPRenewalM:            15,
-		UPnPTimeoutS:            15,
+		NATEnabled:              false,
+		NATLeaseM:               90,
+		NATRenewalM:             15,
+		NATTimeoutS:             15,
 		RestartOnWakeup:         false,
 		AutoUpgradeIntervalH:    24,
 		KeepTemporariesH:        48,