Android 8.0.0 release 22
clatd.c: remove unsetenv("ANDROID_DNS_MODE") am: cc94e5f253 am: 7feee22359 am: 0eedb3a012
am: 90b3e9e874

Change-Id: Ia233ad0f34c7ef3008131f40b7c501f7261911d8