Prevent monkeys from USB tethering. It disconnects the test host. DO NOT MERGE.

Bug: 3443747
Change-Id: Ied9c842e306e299fec7cd201415e0cfad0d29630
diff --git a/src/com/android/settings/TetherSettings.java b/src/com/android/settings/TetherSettings.java
index 9eee4e0..6764c4c 100644
--- a/src/com/android/settings/TetherSettings.java
+++ b/src/com/android/settings/TetherSettings.java
@@ -86,7 +86,7 @@
                 (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
 
         mUsbRegexs = cm.getTetherableUsbRegexs();
-        if (mUsbRegexs.length == 0) {
+        if (mUsbRegexs.length == 0 || Utils.isMonkeyRunning()) {
             getPreferenceScreen().removePreference(mUsbTether);
 
             setTitle(R.string.tether_settings_title_wifi);