extensions: fix wrapcommand/function of class instance 5361771f9714 changed _updatewrapper() to copy the __name__ attribute, but not all callable objects has __name__. Spotted by loading mq with extdiff.

changegroup: avoid creating empty changegroup part Previously this check happened in the changegroup code itself. Since its refactor, this logic needs to move out to callers that care about it, such as this one. Otherwise we get empty bundle devel-warnings in certain extensions. Differential Revision: https://phab.mercurial-scm.org/D690

tests: split test-revset.t in half This test has gotten so large that running it can exceed the normal timeout on systems under load (like if we're running all the tests in parallel). This patch splits the test cleanly in half. Differential Revision: https://phab.mercurial-scm.org/D694