#18273: move the tests in Lib/test/json_tests to Lib/test/test_json and make them discoverable by unittest.  Patch by Zachary Ware.

Patch by Madison May.

on OS-X. Patch by Jeff Ramnani.

Thanks to Stefan Behnel for the report and proposed solution & test.

signal.getsignal returns None for some signals if faulthandler
is enabled (Patch by Jeremy Kloth)

members are integers.

getgroups(2) on OS X 10.8.  Original patch by Mateusz Lenik.

(Done as separate patch from trunk as the code has diverged quite a bit.)

    warning: 'utime.mtime_ns' may be used uninitialized in this function [-Wmaybe-uninitialized]

Patch by Sijin Joseph.

testcleanup directive is new as of 1.1, and we are currently running
1.0.7.  But using testsetup works just as well, and avoids the
unknown directive error when building the docs.

'SHA1' instead of 'SHA'.