Bug#989706: csvformat has a similar warning

[Kingsley G. Morse Jr.]

$ echo -e "1,2,3\n4,5,6\n7,8" | csvformat -d , -D ,
/usr/lib/python3/dist-packages/unittest2/compatibility.py:143: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
1,2,3
4,5,6
7,8

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