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/inventory_cache.py

@@ -0,0 +1,46 @@
+# (c) 2017 Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+
+class ModuleDocFragment(object):
+
+    # inventory cache
+    DOCUMENTATION = """
+options:
+  cache:
+    description:
+      - Toggle to enable/disable the caching of the inventory's source data, requires a cache plugin setup to work.
+    type: boolean
+    default: False
+    env:
+      - name: ANSIBLE_INVENTORY_CACHE
+    ini:
+      - section: inventory
+        key: cache
+  cache_plugin:
+    description:
+      - Cache plugin to use for the inventory's source data.
+    env:
+      - name: ANSIBLE_INVENTORY_CACHE_PLUGIN
+    ini:
+      - section: inventory
+        key: cache_plugin
+  cache_timeout:
+    description:
+      - Cache duration in seconds
+    default: 3600
+    type: integer
+    env:
+      - name: ANSIBLE_INVENTORY_CACHE_TIMEOUT
+    ini:
+      - section: inventory
+        key: cache_timeout
+  cache_connection:
+    description:
+      - Cache connection data or path, read cache plugin documentation for specifics.
+    env:
+      - name: ANSIBLE_INVENTORY_CACHE_CONNECTION
+    ini:
+      - section: inventory
+        key: cache_connection
+"""