Switch to linters job

Prepare deprecation of ansible-lint job and use linters job instead.
Create a new tox environment for this.

Add job to run linters job.

Needed-By: https://review.opendev.org/658682
Change-Id: Ib2c7bdc66077442993d017cf97a4a8116799d130

.zuul.yaml

@@ -0,0 +1,7 @@
+- project:
+    check:
+      jobs:
+        - tox-linters
+    gate:
+      jobs:
+        - tox-linters

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = ansible-lint
+envlist = linters
 skipsdist = True
 
 [testenv]
@@ -12,5 +12,10 @@ whitelist_externals = bash
 commands =
   bash -c "find . -type f -regex '.*.y[a]?ml' -execdir ansible-lint \{\} \;"
 
+[testenv:linters]
+whitelist_externals = bash
+commands =
+    {[testenv:ansible-lint]commands}
+
 [testenv:venv]
 commands = {posargs}