Changelog:
===========
-Fixes a bug that caused event loops to be closed prematurely when using async
generator fixtures with class scope or wider in a function-scoped test
-Fixes various bugs that caused an internal pytest error during test collection
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
