Lookups: use Ansible's config manager whenever possible (#5440)

* Start using Ansible's config manager to handle options.

* Docs improvements.

* Fix documentation, make options actual lookup options.

* The cyberarkpassword lookup does too strange things.

* The onepassword lookups are converted in #4728, let's not interfere.

* Improve docs.

* Skip shelvefile as well.

* Convert lmdb_kv.

* Convert and fix credstash.

* Convert manifold.

* Drop chef_databag.

* Convert dig.

* Update examples.

* Forgot the most important part.

* Fix lmdb_kv docs.

* Python 2.6 compatibility.

* Convert AnsibleUnicode to str.

* Load lookup with lookup loader.

* Fix environment handling and error message checking.

* Improve docs formatting.

plugins/lookup/cartesian.py

@@ -15,9 +15,11 @@ DOCUMENTATION = '''
         - It is clearer with an example, it turns [1, 2, 3], [a, b] into [1, a], [1, b], [2, a], [2, b], [3, a], [3, b].
          You can see the exact syntax in the examples section.
     options:
-      _raw:
+      _terms:
         description:
           - a set of lists
+        type: list
+        elements: list
         required: true
 '''
 
@@ -69,6 +71,7 @@ class LookupModule(LookupBase):
         return results
 
     def run(self, terms, variables=None, **kwargs):
+        self.set_options(var_options=variables, direct=kwargs)
 
         terms = self._lookup_variables(terms)