Adb is disconnecting during Monkey Test Run.

When running the monkey test, its going in tethering page
inside Settings app and enabling ethernet tethering.
Due to get adb connection is getting lost.

Guarding ethernet tethering option when monkey test is running,
it will not display ethernet tethering option during monkey test.

Bug:
Test: start monkey test run using below command
adb shell monkey -v 1000000

Change-Id: I4040cb088404e663b032179ff52b1bc564ecf76b
Signed-off-by: Ankit Agrawal <ankit.agarwal@intel.com>