testsuite: fix on systems with flux-accounting already installed #467
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Problem: When flux-accounting is already installed on a system, the sharness tests pull in the installed version of flux-accounting Python modules instead of the test version. This occurs because sharness prepends the source tree Python path to PYTHONPATH, which is then subverted by flux-core's
py-runner.py
, which prepends the system path in front of that before executing Python subcommands like the accounting service etc.Use FLUX_PYTHONPATH_PREPEND instead of PYTHONPATH, which is preserved by the py-runner.py wrapper.