tests: fix module-import warnings in test-update-atomic.t These were caught by test-check-module-imports.t on Python 3. This should also make python3-buildbot green again. Differential Revision: https://phab.mercurial-scm.org/D5674

py3: use dict.items() instead of dict.iteritems() in tests/test-lfs-server.t dict.iteritems() is not present on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5673

py3: add b'' prefixes in tests/test-lfs-serve.t # skip-blame because just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D5672

py3: add b'' prefixes in doc/check-seclevel.py # skip-blame because just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D5670

tests: remove some over-globbing in test-dispatch.t Hilariously, this was exposed by Python 3 work. Differential Revision: https://phab.mercurial-scm.org/D5689

py3: port test-parseindex.t to Python 3 Differential Revision: https://phab.mercurial-scm.org/D5686

py3: almost fix test-trusted.py The test now only fails due to output format changes on the repr of mercurial.error.ParseError. I'm not really sure how to approach that for now. Differential Revision: https://phab.mercurial-scm.org/D5685

merge with stable

rust-cpython: raising error.WdirUnsupported The Graph implementation of hg-cpython returns the appropriate error upon encounter with the working directory special revision number, and this gives us in particular a code path to test from test-rust-ancestors.py In the current implementation, the exception is actually raised from the iterator instantiation; we are nonetheless consuming the iterator in the test with `list()` in order not to depend on implementation details.

rust: error for WdirUnsupported with cpython conversion as exception This introduces WorkingDirectoryUnsupported as an enum variant of GraphError in the core and converts it to the expected `mercurial.error.WdirUnsupported`.