Get rid of unused greenlet things in test_resource

Removing useless test cases containing greenlet.GreenletExit
for the sake of 56d5fb9f83b647d27a00d56cb4dad8aad9e1169f

Change-Id: I6a1463c8467ee1750a66b00758428bc74f9371eb
Merge "Get rid of unused greenlet things in test_resource"