* bpo-30871: Add test.pythoninfo (#3075)
* Add Lib/test/pythoninfo.py: script collecting various informations
about Python to help debugging test failures.
* regrtest: remove sys.hash_info and sys.flags from header.
* Travis CI, Appveyor: run pythoninfo before tests
(cherry picked from commit b907abc885)
* bpo-30871: pythoninfo: add expat and _decimal (#3121)
* bpo-30871: pythoninfo: add expat and _decimal
* Remove _decimal.__version__
The string is hardcoded, not really interesting.
(cherry picked from commit f6ebd838f0)
* bpo-30871: Add "make pythoninfo" (#3120)
(cherry picked from commit a3a01a2fce)
* bpo-30871: pythoninfo: more sys, os, time data (#3130)
* bpo-30871: pythoninfo: more sys, os, time data
PythonInfo now converts types other than intger to string by default.
* fix typo
(cherry picked from commit ad7eaed543)
* bpo-31231: Fix pythoninfo in Travis config (#3134)
bpo-31231, bpo-30871: Replace "./python -m test.pythoninfo" with
"make pythoninfo", since macOS uses ./python.exe.
(cherry picked from commit 92b1f90143)
(cherry picked from commit 29d007bb670b486788f73c2d742b0ad0b679ff13)
