py3: fix crash when server address is 0.0.0.0 (issue6362) `socket.getfqdn()` assumes that the name is passed as `str` on Python 3 and always returns `str` in this case. Mercurial passed `bytes` (but still expected a `str` result), which worked by chance in many cases, except for e.g. b'0.0.0.0', which was returned unchanged, breaking later code. Instead of calling `socket.getfqdn()`, we can also use `self.server_name` from the base `HTTPServer` class, which already stores the FQDN of the locally-bound socket name (see `BaseHTTPServer.py` in the Python 2 stdlib and `http/server.py` in the Python 3 stdlib).

ui: fix Python 2.7 support for ui.timestamp-output Differential Revision: https://phab.mercurial-scm.org/D8675

merge with stable

run-tests: find python binary on Python 3 (issue6361) Return strings from _findprogram as all callers expect unicode strings. Previously the check in _usecorrectpython agains sysexecutable was always false on Python 3. Differential Revision: https://phab.mercurial-scm.org/D8674

tests: ignore possible diagnostics from gpg 2.2 Differential Revision: https://phab.mercurial-scm.org/D8672

Added signature for changeset 0ea9c86fac89