[BEAM-3731] Enable tests to run in Python 3#4730

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luke-zhu wants to merge 8 commits into

apache:masterfrom

luke-zhu:python3-v2

Commits on Feb 24, 2018

Python-modernize on coders/
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Python-modernize on io/
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Python-modernize on transforms
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Python-modernize on runners/
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Python-modernize on other files
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Hand-removed remaining issues preventing "python3 setup.py test"
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Removed unnecessary list() calls.
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Use iteritems in gcsfilesystem
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