Upgrade pylint, tweak config (#28798)

* Upgrade pylint to 2.4.4 and astroid to 2.3.3

https://pylint.readthedocs.io/en/latest/whatsnew/changelog.html#what-s-new-in-pylint-2-4-4
https://github.com/PyCQA/astroid/blob/astroid-2.3.3/ChangeLog

* Disable pylint score and persistence

We don't use scoring, and it can be supposedly incorrect (so worse
than ignorable) when using more than one parallel job.

pylintrc

@@ -3,6 +3,7 @@ ignore=tests
 # Use a conservative default here; 2 should speed up most setups and not hurt
 # any too bad. Override on command line as appropriate.
 jobs=2
+persistent=no
 
 [BASIC]
 good-names=id,i,j,k,ex,Run,_,fp
@@ -49,7 +50,7 @@ disable=
   unused-argument
 
 [REPORTS]
-reports=no
+score=no
 
 [TYPECHECK]
 # For attrs

requirements_test.txt

@@ -8,8 +8,8 @@ codecov==2.0.15
 mock-open==1.3.1
 mypy==0.740
 pre-commit==1.20.0
-pylint==2.4.3
-astroid==2.3.2
+pylint==2.4.4
+astroid==2.3.3
 pytest-aiohttp==0.3.0
 pytest-cov==2.8.1
 pytest-sugar==0.9.2