DAOS-623 ci: Add config and Action for python formatting.

.flake8

@@ -13,4 +13,4 @@ exclude =
     build,
     install
 max-line-length: 100
-ignore=W503
+ignore=W503,E203

.flake8-scons

@@ -13,4 +13,4 @@ exclude =
     install
 filename=*/SConscript, SConstruct
 max-line-length: 100
-ignore=F821,F841,W503
+ignore=F821,F841,W503,E203

.github/workflows/flake.yml

@@ -28,12 +28,12 @@ jobs:
         with:
           # W503 and W504 are related as they conflict.  W503 is the preferred style and all code
           # should be using it now.
-          ignore: 'W503'
+          ignore: 'W503,E203'
           exclude: 'src/control/vendor,src/client/pydaos/raw'
           max-line-length: '100'
       - name: flake8 Lint on SCons files.
         uses: py-actions/flake8@v2
         with:
-          ignore: 'F821,W503,F841'
+          ignore: 'F821,W503,F841,E203'
           max-line-length: '100'
           args: '--filename */SConscript, SConstruct'

.github/workflows/linting.yml

@@ -40,3 +40,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Check DAOS logging macro use.
         run: ./utils/cq/d_logging_check.py --github src
+      - name: Black
+        uses: psf/black@stable
+        with:
+          options: "--check --verbose --extend-exclude (ftest|vendor)"