[issue17484] add tests for getpass

[Thomas Fenzl]

New submission from Thomas Fenzl:

This is a patch adding tests for the platform independend and unix specific parts of getpass.
I also default initialized passwd in unix_getpass. Otherwise almost all tests would require full mocking of termios settings and such.

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keywords: +patch
Added file: http://bugs.python.org/file29490/getpass_tests.diff

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