Fixed memory leaks and UI improvements

Change-Id: I830d838b287915e37fe018787a85c9a2dfb7a3a7
diff --git a/linux/fib-input-dialog.h b/linux/fib-input-dialog.h
index f4f8d27..5486cbb 100644
--- a/linux/fib-input-dialog.h
+++ b/linux/fib-input-dialog.h
@@ -22,6 +22,7 @@
 
 public:
     FibInputDialog(QWidget *parent = 0);
+    void clear();
     QString getPrefixName();
     QString getEndpoint();
     QString getTunnelType();