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