Fix some intermittent test failures due to failure to import plugin #5937
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While trying to test mypy_mypyc wheels in travis on OS X, I pretty
consistently got failures trying to import a plugin module. I had
trouble reproducing it anywhere else, but the issue turned out to be a
cousin of the dreaded stubgen flake (#4811), where caching in
importlib causes a file to be missed even though it is present now.
Here we solve it by using absolute paths in the
load_pluginsmanipulations of sys.path.