Add a dump method to TetherController

Test: manual
Change-Id: I56834d4dd8afa49460e4e02e084b4f268a51d3fe
diff --git a/server/NetdNativeService.cpp b/server/NetdNativeService.cpp
index c951c24..86826f5 100644
--- a/server/NetdNativeService.cpp
+++ b/server/NetdNativeService.cpp
@@ -208,6 +208,9 @@
     gCtls->clatdCtrl.dump(dw);
     dw.blankline();
 
+    gCtls->tetherCtrl.dump(dw);
+    dw.blankline();
+
     {
         ScopedIndent indentLog(dw);
         if (contains(args, String16(OPT_SHORT))) {