Rename tethering util folder and its package name

Move tethering util files from android.net.util into
com.android.networkstack.tethering.util. The goal is move all of
tethering internal files into its own namespace
com.android.networkstack.tethering.util.

Bug: 205088391
Test: atest TetheringTests
      atest CtsTetheringTest
      atest TetheringPrivilegedTests

Change-Id: I6559fb4f873b3cad5b210b10e49df1b6c6914a70
diff --git a/Tethering/jni/onload.cpp b/Tethering/jni/onload.cpp
index fbae615..72895f1 100644
--- a/Tethering/jni/onload.cpp
+++ b/Tethering/jni/onload.cpp
@@ -22,10 +22,10 @@
 
 namespace android {
 
-int register_android_net_util_TetheringUtils(JNIEnv* env);
 int register_com_android_net_module_util_BpfMap(JNIEnv* env, char const* class_name);
 int register_com_android_networkstack_tethering_BpfCoordinator(JNIEnv* env);
 int register_com_android_networkstack_tethering_BpfUtils(JNIEnv* env);
+int register_com_android_networkstack_tethering_util_TetheringUtils(JNIEnv* env);
 
 extern "C" jint JNI_OnLoad(JavaVM* vm, void*) {
     JNIEnv *env;
@@ -34,7 +34,7 @@
         return JNI_ERR;
     }
 
-    if (register_android_net_util_TetheringUtils(env) < 0) return JNI_ERR;
+    if (register_com_android_networkstack_tethering_util_TetheringUtils(env) < 0) return JNI_ERR;
 
     if (register_com_android_net_module_util_BpfMap(env,
             "com/android/networkstack/tethering/util/BpfMap") < 0) return JNI_ERR;