Clarify the text of waiting for state

Make it clear that we wait for a mode.

Test: unit tests
Bug: None
Change-Id: Ia73f1442594f204db5c07d2a6750fcdffd84269f
diff --git a/src/com/android/tradefed/device/NativeDeviceStateMonitor.java b/src/com/android/tradefed/device/NativeDeviceStateMonitor.java
index efa7f2f..ac74c7b 100644
--- a/src/com/android/tradefed/device/NativeDeviceStateMonitor.java
+++ b/src/com/android/tradefed/device/NativeDeviceStateMonitor.java
@@ -501,8 +501,9 @@
             CLog.i("Device %s is already %s", deviceSerial, state);
             return true;
         }
-        CLog.i("Waiting for device %s to be %s; it is currently %s...", deviceSerial,
-                state, getDeviceState());
+        CLog.i(
+                "Waiting for device %s to be in %s mode; it is currently in %s mode...",
+                deviceSerial, state, getDeviceState());
         DeviceStateListener listener = new DeviceStateListener(state);
         addDeviceStateListener(listener);
         synchronized (listener) {