qemu-iotests: make cancel_and_wait() common
The cancel_and_wait() function has been duplicated in 030 and 041. Move it into iotests.py and let it return the event so tests can perform additional asserts. Note that 041's cancel_and_wait(wait_ready=True) is replaced by wait_ready_and_cancel(), which uses the new wait_ready() and cancel_and_wait() underneath. Suggested-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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