Refactor the control code to be more like a module.

Change control_dispatch_msg() to return the change of control connection
count since the return value was not used before.
Add control_fill_pfds() to replace the TAILQ_FOREACH loop in session.c.
This allows to move the ctl_conns symbol to control.c (from session.h
where it caused issues when compiled with -fno-common).
OK benno@

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