more stress tests of the queue!

bugfixes:
	1) forgot to put import errno in previous checkin.
	2) tempfile.mktemp() didn't suffice for creating unique
	   filenames with lots of concurrent processes going on,
	   so i made it set tempfile.template with the current pid
	   in it.
this has been tested with multiple concurrent contact_transport
processes together with a run_queue process -- with and without smtpd
listening on mailman's SMTPHOST.
the version of OutgoingQueue prior to these two checkins ran for
about a week on linux and Solaris without problem.  when these
problems did creep up, they were harmless.  they *could* have
caused failed deliveries, but it would be pretty darn unlikely.
scott

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