Check device revoke when during vmbus pcib attach

[whu]

Summary

It is possible that the vmbus pcib channel is revoked during attach path. The attach path could be waiting for response from host and this response could never arrived since the channel has already been revoked from host point of view. Check this situation during wait complete and return failed if this happens.

[whu]

add saved_done to avoid missing wake-up.

[whu]

revised wait_for_completion_timeout() call to avoid missing complete message