Clean up BOTMETA.yml (#44574)

This PR includes:
- Removal of maintainers that are listed as author in the module
- Removal of entries that do not extend the original author list
- Move ignored-statement to namespace/directory (where useful)
- In some cases, fix the authors-list or add missing github id

We end up with a list of exceptions/additions and a large set of
namespace/directory maintainers or team of maintainers.

Some entries could be further improved by discussing with some
maintainers.

lib/ansible/modules/cloud/rackspace/rax_mon_entity.py

@@ -47,7 +47,7 @@ options:
     - Hash of arbitrary C(name), C(value) pairs that are passed to associated
       rax_mon_alarms. Names and values must all be between 1 and 255 characters
       long.
-author: Ash Wilson
+author: Ash Wilson (@smashwilson)
 extends_documentation_fragment: rackspace.openstack
 '''