Add ansible-lint support and factor out PEP8 handler

ale_linters/ansible/ansible-lint.vim

@@ -0,0 +1,15 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: ansible-lint for ansible-yaml files
+
+if exists('g:loaded_ale_linters_ansible_ansiblelint')
+    finish
+endif
+
+let g:loaded_ale_linters_ansible_ansiblelint = 1
+
+call ale#linter#Define('ansible', {
+\   'name': 'ansible',
+\   'executable': 'ansible',
+\   'command': g:ale#util#stdin_wrapper . ' .yml ansible-lint -p',
+\   'callback': 'ale#handlers#HandlePEP8Format',
+\})