Wakes up a suspended fiber.
If a fiber was suspended without specifying the next {@link Tube}, then the execution will be resumed in the response processing direction, by calling the {@link Tube#processResponse(Packet)} method on the next/first {@link Tube} in the {@link Fiber}'s processing stack with the specified resume packet as the parameter.
If a fiber was suspended with specifying the next {@link Tube}, then the execution will be resumed in the request processing direction, by calling the next tube's {@link Tube#processRequest(Packet)} method with the specified resume packet as the parameter.
This method is implemented in a race-free way. Another thread can invoke this method even before this fiber goes into the suspension mode. So the caller need not worry about synchronizing {@link NextAction#suspend()} and this method.
@param resumePacket packet used in the resumed processing