test_checkconfig: always create different config dir #2704
Merged
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fix for python3
It looks like python3 added some optimization for the import method.
both tests are importing files from _trialtemp/configdir , but between the two tests, the list available modules actually change.
In the second test however, if you run from within the same python runtime, then python won't look again at the directory, and thus wont see it has changed since last time.
So it will not find the new module. If we change 'configdir' with mkstemp, then it will work.
also remove a warning from https://twistedmatrix.com/trac/ticket/9023#ticket