Fix unstable parallel tests (#202)

* update interface tests and configuration messages

* little debug

* little debug on both errors

* print all devs

* list of devices

* debug func

* handle interface close

* debug socks

* debug socks

* if ports match

* use random assigned ports

* remove unused const

* close management client connection when stopping engine

* GracefulStop when management clients are closed

* enable workflows on PRs too

* remove iface_test debug code

management/server/management_proto_test.go

@@ -110,7 +110,7 @@ func Test_SyncProtocol(t *testing.T) {
 		t.Fatal(err)
 		return
 	}
-	defer mgmtServer.Stop()
+	defer mgmtServer.GracefulStop()
 
 	client, clientConn, err := createRawClient(fmt.Sprintf("localhost:%d", mport))
 	if err != nil {