Supervisor starts children in parallel

[Vance Shipley]

The supervisor behaviour seems to start it's children in parallel.
I have a supervisor with two children in a one_for_all strategy.
This causes a chicken and egg problem when these processes act as
a pair.  If they were started synchronously and in order there 
wouldn't be a problem.  It would be very handy if there were a
flag to specify either a synchronous or asynchronous startup.

How do folks deal with this?

	-Vance