remotefilelog: cast division result to an int Otherwise mid is a float and this confuses __slice__ on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5760

tests: cast division result to int Otherwise it is a float on Python 3 and code later compares about casting a float to an int. Differential Revision: https://phab.mercurial-scm.org/D5759

tests: various Python 3 ports for test-remotefilelog-datapack.py Use bytes I/O. Use byteschr(). Convert temporary path to bytes. Differential Revision: https://phab.mercurial-scm.org/D5758