Masayuki Igawa e7cf550d53 Add a doc and test for data_utils.rand_password
This commit adds a documentation and a test about the length
parameter to data_utils.rand_password to clarify the behavior.

Change-Id: I26c7380d1430f107c0aaf705d160d8782b850438
2015-06-05 00:56:44 +09:00
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