[DESCRIPTION]
一、USB Accessory Test测试，不要求测试机端支持OTG；
因此取消usb.host不会影响此项测试；
<meta-data android:name="test_category" android:value="@string/test_category_hardware" />
<meta-data android:name="test_required_features" android:value="android.hardware.usb.accessory" />
<meta-data android:name="test_excluded_features"
二、USB Accessory Test测试方法：
1、Install the Cts Vefifier USB Companion app on a separate helper device;
2、Start the accessory test companion in the Cts Verifier USB compannion;
3、Connect the two devices, if using a otg adapter make sure the adapter directly conected to the helper device.if using an type-c cable make sure that the helper device is set as supply power to the attached device.
[SOLUTION]
因此，测试此项关键点，是辅助机需要支持OTG；且需要辅助机要已通过GMS认证之手机，例如Nexus N6P；