Explicitly order keyword arguments in SpyCall.__repr__.
Review Request #11913 — Created Jan. 9, 2022 and submitted
kwargsdictionary in the resulting
string, but this led to random comparison problems in unit tests on
Python 2.7 and earlier 3.x.
This problem was already solved in the unit test assertion helpers. The
ordering function has now been moved into
kgb.utilsand is called in
Unit tests pass on all supported versions of Python.