py3: stop subscripting socket.error In 3.3 and later, this is now an alias for OSError. I hacked up the server code enough that I was able to trigger the exception handler in server.py from test-http-bundle1.t. Other instances of this either subscript through the `args` member, or reference the errno or strerror attributes. Note that on Windows, the errno value seems to reflect the Winsock error, so the various tests for EPIPE seem like they would always fail. But that seems to be the case in py2 as well.

test: update test-logtoprocess.t to not requires less The test previously assumed that a working pager was present in the test environment. Update it to use the fakepager instead. Differential Revision: https://phab.mercurial-scm.org/D5399

py3: quote several instances of $PYTHON for Windows Python3 lives in Program Files by default. The last remaining unquoted instance is in test-hghave.t. I can't figure out how to quote that, as it either complains: 'c:\\Program' is not recognized as an internal or external command, operable program or batch file. or $TESTTMP.sh: line 22: "C:/Program Files/Python37/python.exe": $ENOENT$