Support multiple Molecule scenarios

Other changes:
- run linters before tests
- return [pylint] and [pycodestyle] back on the list (some IDE's
  rely on this)

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    py{26,27,36,37,38},
     black, pylint, flake8,
+    py{26,27,36,37,38},
     molecule_{lint,syntax,test},
     extra
 skipsdist = true
@@ -167,21 +167,21 @@ commands_pre =
     molecule --version
     ansible --version
 commands =
-    molecule {posargs} lint
+    molecule lint -s {env:LSR_MSCENARIO:default} {posargs}
 
 [testenv:molecule_syntax]
 envdir = {toxworkdir}/env-{env:TRAVIS_PYTHON_VERSION:molecule}
 deps =
     {[molecule]deps}
 commands =
-    molecule {posargs} syntax
+    molecule syntax -s {env:LSR_MSCENARIO:default} {posargs}
 
 [testenv:molecule_test]
 envdir = {toxworkdir}/env-{env:TRAVIS_PYTHON_VERSION:molecule}
 deps =
     {[molecule]deps}
 commands =
-    molecule {posargs} test
+    molecule test -s {env:LSR_MSCENARIO:default} {posargs}
 
 # Here we provide a way how a role can add its custom command to be run. Such
 # extra command is run at the end of each testenv run and is driven by
@@ -225,6 +225,13 @@ show_source = true
 max-line-length = 88
 ignore = E402,W503
 
+[pylint]
+max-line-length = 88
+disable = wrong-import-position
+
+[pycodestyle]
+max-line-length = 88
+
 [travis]
 python =
   2.6: py26,extra