treewide: Add clang-tidy

Change-Id: I1aab00b0ff8c016650225fcd1c83678a91808941
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/ethernet_interface.hpp b/src/ethernet_interface.hpp
index 0b6e21a..0e9c536 100644
--- a/src/ethernet_interface.hpp
+++ b/src/ethernet_interface.hpp
@@ -187,7 +187,7 @@
 
     /** @brief delete all dbus objects.
      */
-    void deleteAll();
+    void deleteAll() override;
 
     /** @brief set the default v4 gateway of the interface.
      *  @param[in] gateway - default v4 gateway of the interface.