Added SaltPyLint so that the saltpylint.pep8 plugin can be used.

Author: mbucknell

build.sbt

@@ -41,6 +41,8 @@ val installAll =
      |python3 -m pip install pylint-common==0.2.2 &&
      |python -m pip install pylint-celery==0.3 &&
      |python3 -m pip install pylint-celery==0.3 &&
+     |python -m pip install SaltPyLint=2017.12.15 &&
+     |python3 -m pip install SaltPyLint==2017.12.15 &&
      |python -m pip install pylint==1.7.5 --upgrade --ignore-installed --no-cache-dir &&
      |python3 -m pip install pylint==1.7.5 --upgrade --ignore-installed --no-cache-dir &&
      |python -m pip uninstall -y pip &&