tests: fix various test-check-module-imports.t violations Somehow these are only caught when running the test under Python 3. Differential Revision: https://phab.mercurial-scm.org/D2580

pycompat: prevent encoding or decoding values if not required pycompat.py has functions strurl and bytesurl which decodes and encodes the url passed on Python 3 respectively. In some cases, strurl gets a url which is already str and bytesurl gets a url which is already bytes. Let's prevent encoding or decoding the values again if not required. Differential Revision: https://phab.mercurial-scm.org/D2472

py3: add some b'' to make test-lock-badness.t happy

py3: fix formatting of lock error message

py3: fix some unicode madness in global exception catcher

py3: pass a system-string filename to sub-classes of IOError

py3: fix some membership tests on linkrev adjustment

py3: make test-basic.t pass on Python 3

py3: silence the final IOError by closing stdout/err slightly early Fixes the following test failure: $ hg status >/dev/full abort: No space left on device Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' ... OSError: [Errno 28] No space left on device [120]

py3: conditionalize initialization of stdio flags Since Python 3 doesn't depend on the stdio of libc, there should be no need to set O_BINARY flag on Windows.