pycompat: prevent encoding or decoding values if not required pycompat.py has functions strurl and bytesurl which decodes and encodes the url passed on Python 3 respectively. In some cases, strurl gets a url which is already str and bytesurl gets a url which is already bytes. Let's prevent encoding or decoding the values again if not required. Differential Revision: https://phab.mercurial-scm.org/D2472

py3: add some b'' to make test-lock-badness.t happy

py3: fix formatting of lock error message

py3: fix some unicode madness in global exception catcher