controlling jobs of unit tests

[Jonathan Brannan-2]

I found an issue with a few of my unit tests where, in a full build,
they are running release-static, release-shared, debug-static,
debug-shared at the same time (seperate -j jobs).  This causes them to
randomly fail because they interact with the local network the same.
Is there a way to control this?  I saw the JAM_SEMAPHORE, but it only
works with the lower jam targets.
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