Add stub of avoidUnvalidated() to ConnectivityServiceMock.

Bug: 31075769
Change-Id: I18041a2d11895f3d9b00f077dc4eef1f450e791c

tests/telephonytests/src/com/android/internal/telephony/mocks/ConnectivityServiceMock.java

@@ -604,6 +604,10 @@ public class ConnectivityServiceMock extends IConnectivityManager.Stub
         throw new RuntimeException("not implemented");
     }
 
+    public void setAvoidUnvalidated(Network network) {
+        throw new RuntimeException("not implemented");
+    }
+
     public int tether(String iface) {
         throw new RuntimeException("not implemented");
     }