py3: string normalization and I/O tweaks in test-lfs.t
The print was inserting b'' on Python 3. In addition, since we
weren't writing to the ui instance (which isn't readily available
in this function), output order could get mixed up.
We add some pycompat casts and a stdout flush to make the test
happy on all Python versions.
Differential Revision: https://phab.mercurial-scm.org/D7938
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