Optimize how slaves are assigned builds. #19
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It is preferable to assign a build to a slave who is
idle (already spun up and waiting) over a slave that has yet
to be started or a busy one. If there are no idle slaves,
and there is one that can be spun up, then spin one up.
Otherwise, randomly choose among our busy slaves.
Signed-off-by: Giuseppe Di Natale dinatale2@llnl.gov