Switch py test server from running on thread to child process
Switch py test server from running on thread to child process

subprocess calls block all threads on Magellan, apparently, which leads
to really annoying bugs
olsonanl/typecomp,olsonanl/typecomp,kbase/typecomp,kbase/typecomp,olsonanl/typecomp,olsonanl/typecomp,kbase/typecomp