#20933: At least one place maps 'test' to 'localhost'...fix test.

Discovery and patch by Wenzhu Man.  University of Waterloo apparently
maps the local name 'test' to localhost, which is in the bypass list,
causing the test to fail.  So change 'test' to a name unlikely to get
mapped to localhost.
remove unused zero constants
only define zero constant when it is used
avoid referencing past the bounds of an array
remove runtime_library_dirs for _sqlite; it isn't needed
Issue #20939: Fix test_geturl failure in test_urllibnet due to
new redirect of http://www.python.org/ to https://www.python.org.
send people to the right editors page (#20938)
Close #16665: improve documentation for hex().  Patch by Jessica McKellar.