vfs: use 'vfs' module directly in 'mercurial.subrepo'
Now that the 'vfs' classes moved in their own module, lets use the new module
directly. We update code iteratively to help with possible bisect needs in the
future.
#require test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "$TESTDIR"/..
$ hg files 'set:(**.py)' | sed 's|\\|/|g' | xargs python contrib/check-py3-compat.py
contrib/python-zstandard/setup.py not using absolute_import
contrib/python-zstandard/setup_zstd.py not using absolute_import
contrib/python-zstandard/tests/common.py not using absolute_import
contrib/python-zstandard/tests/test_compressor.py not using absolute_import
contrib/python-zstandard/tests/test_data_structures.py not using absolute_import
contrib/python-zstandard/tests/test_decompressor.py not using absolute_import
contrib/python-zstandard/tests/test_estimate_sizes.py not using absolute_import
contrib/python-zstandard/tests/test_module_attributes.py not using absolute_import
contrib/python-zstandard/tests/test_roundtrip.py not using absolute_import
contrib/python-zstandard/tests/test_train_dictionary.py not using absolute_import
i18n/check-translation.py not using absolute_import
setup.py not using absolute_import
tests/test-demandimport.py not using absolute_import
#if py3exe
$ hg files 'set:(**.py) - grep(pygments)' -X hgext/fsmonitor/pywatchman \
> | sed 's|\\|/|g' | xargs $PYTHON3 contrib/check-py3-compat.py \
> | sed 's/[0-9][0-9]*)$/*)/'
hgext/convert/transport.py: error importing: <ImportError> No module named 'svn.client' (error at transport.py:*)
hgext/fsmonitor/state.py: error importing: <SyntaxError> from __future__ imports must occur at the beginning of the file (__init__.py, line 30) (error at watchmanclient.py:*)
hgext/fsmonitor/watchmanclient.py: error importing: <SyntaxError> from __future__ imports must occur at the beginning of the file (__init__.py, line 30) (error at watchmanclient.py:*)
mercurial/cffi/bdiff.py: error importing: <ImportError> No module named 'mercurial.cffi' (error at check-py3-compat.py:*)
mercurial/cffi/mpatch.py: error importing: <ImportError> No module named 'mercurial.cffi' (error at check-py3-compat.py:*)
mercurial/cffi/osutil.py: error importing: <ImportError> No module named 'mercurial.cffi' (error at check-py3-compat.py:*)
mercurial/scmwindows.py: error importing: <ImportError> No module named 'msvcrt' (error at win32.py:*)
mercurial/win32.py: error importing: <ImportError> No module named 'msvcrt' (error at win32.py:*)
mercurial/windows.py: error importing: <ImportError> No module named 'msvcrt' (error at windows.py:*)
#endif
#if py3exe py3pygments
$ hg files 'set:(**.py) and grep(pygments)' | sed 's|\\|/|g' \
> | xargs $PYTHON3 contrib/check-py3-compat.py \
> | sed 's/[0-9][0-9]*)$/*)/'
#endif