Takashi Kajinami bd93d44bb4 Make sure all temp files get deleted in test_ringbuilder
This patch makes test_ringbuilder create a temporal directory,
run ring builder commands under it, and delete it after testing
for each test cases, to fix temp file leaking.

Change-Id: I6f59fe095ea6485af0e60b5a8e8fc3892e0a0f90
2016-02-29 18:21:46 +09:00
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