Add a dump method to TetherController

Test: manual
Change-Id: I56834d4dd8afa49460e4e02e084b4f268a51d3fe
diff --git a/server/TetherController.h b/server/TetherController.h
index 7f8ba06..c83267b 100644
--- a/server/TetherController.h
+++ b/server/TetherController.h
@@ -21,6 +21,7 @@
 #include <set>
 #include <string>
 
+#include <netdutils/DumpWriter.h>
 #include <netdutils/StatusOr.h>
 #include <sysutils/SocketClient.h>
 
@@ -145,6 +146,9 @@
 
     std::mutex lock;
 
+    void dump(netdutils::DumpWriter& dw);
+    void dumpIfaces(netdutils::DumpWriter& dw);
+
   private:
     bool setIpFwdEnabled();
     std::vector<char*> toCstrVec(const std::vector<std::string>& addrs);