Remove one-line function in test_volumes_actions

In I526f8940c4f29a93f25f896bc4779a771f4c3eb5, _reset_volume_status's
return value is removed and so it becomes a one-line function. Jordan
Pittier points out that "It's better to directly use
admin_volume_client.reset_volume_status() in tests instead of
calling an alias.", so this is to remove the one-line function to
keep code clean.

Change-Id: I89bb06c15a4f2ac9b55f1ee5437f92eb885f05ca
1 file changed