Doc fragments to plugins (#50172)

* promote doc_fragments into actual plugins

  change tests hardcoded path to doc fragments
  avoid sanity in fragments
  avoid improper testing of doc_fragments
  also change runner paths
 fix botmeta
 updated comment for fragments
 updated docs

lib/ansible/plugins/doc_fragments/validate.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2015, Ansible, Inc
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+
+class ModuleDocFragment(object):
+    # Standard documentation fragment
+    DOCUMENTATION = r'''
+options:
+  validate:
+    description:
+    - The validation command to run before copying into place.
+    - The path to the file to validate is passed in via '%s' which must be present as in the examples below.
+    - The command is passed securely so shell features like expansion and pipes will not work.
+'''