Send a message to an actor that is MDCContextAware - it will propagate the current MDC values.
Send a message to an actor that is MDCContextAware - it will propagate the current MDC values. Note: we MUST capture the ActorContext in order for senders to be correct! This was a bug from the original author.
"Ask" an actor that is MDCContextAware for something - it will propagate the current MDC values
Add two new methods that allow MDC info to be passed to MDCContextAware actors.
Do NOT use these methods to send to actors that are not MDCContextAware.