Parallelize pylint everywhere (#28149)

* Run 2 pylint jobs by default

* Run pylint with autodetected number of jobs in Travis

Gives a ~25% speedup there at the moment.

.travis.yml

@@ -19,7 +19,7 @@ matrix:
     - python: "3.6.1"
       env: TOXENV=lint
     - python: "3.6.1"
-      env: TOXENV=pylint
+      env: TOXENV=pylint PYLINT_ARGS=--jobs=0
     - python: "3.6.1"
       env: TOXENV=typing
     - python: "3.6.1"

azure-pipelines-ci.yml

@@ -167,7 +167,7 @@ stages:
       displayName: 'Install Home Assistant'
     - script: |
         . venv/bin/activate
-        pylint -j 2 homeassistant
+        pylint homeassistant
       displayName: 'Run pylint'
   - job: 'Mypy'
     pool:

pylintrc

@@ -1,5 +1,8 @@
 [MASTER]
 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
 
 [BASIC]
 good-names=id,i,j,k,ex,Run,_,fp

tox.ini

@@ -26,7 +26,7 @@ deps =
      -r{toxinidir}/requirements_test.txt
      -c{toxinidir}/homeassistant/package_constraints.txt
 commands =
-     pylint {posargs} homeassistant
+     pylint {env:PYLINT_ARGS} {posargs} homeassistant
 
 [testenv:lint]
 deps =