tests: add support for listing tests to run in a file This will make it easier for us to run the tests in the python3 whitelist in buildbot.

python3: remove test-update-dest.t from the whitelist I've poked at this on and off several times, and I can't figure out what regressed. Let's kick this out of the whitelist for now so that we can get the *rest* of our progress covered by the buildbots.

bundle2: move part processing to a separate function Now that the part processing loop is tiny, let's move it to a separate function. This will allow extensions to completely replace the part processing logic, without having to replace the overall bundle processing logic or the stream maintenance logic. This will be useful for the infinitepush extension, so it can completely take over receiving a bundle and rerouting it to a side store. This will also make it easier to upstream the infinitepush functionality later. Differential Revision: https://phab.mercurial-scm.org/D709

bundle2: remove unnecessary try finally This is no longer needed. Differential Revision: https://phab.mercurial-scm.org/D708

bundle2: move handler validation out of processpart As part of refactoring bundle part processing let's move handler validation to its own function. Differential Revision: https://phab.mercurial-scm.org/D707

bundle2: move processpart stream maintenance into part iterator The processpart function also did some stream maintenance, so let's move it to the part iterator as well, as part of moving all part iteration logic into the class. There is one place processpart is called outside of the normal loop, so we manually handle the seek there. The now-empty try/finally will be removed in a later patch, for ease of review. Differential Revision: https://phab.mercurial-scm.org/D706

merge with stable

py3: convert system strings to bytes in doctest of formatter.py

py3: rewrite stdout hack of doctest by using ui.pushbuffer() We can't use pycompat.stdout here because the doctest runner replaces sys.stdout with a string buffer.

py3: use bytes os.sep in doctest of pathutil.py