univention: add common code for univention corporate server modules (#16172)
univention: add common code for univention corporate server modules (#16172)

* univention: add common code for univention corporate server modules

* univention: try import only univention specific libraries

* Code Review with @2-B, slight API changes and refactoring.

* Added module documentation overview, describing the provided functions
* Moved module-global objects into getter functions, so that we don't
  need to import possibly-unavailable univention modules at the module level.
* Renamed some exports for improved consistency:

  - module_name()    -> module_by_name()
  - orig_ldap        -> ldap_module()
  - ldap             -> uldap()

Note that this introduces slight API changes from the outside. Instead of
directly accessing module properties, you now have module functions with the
same name. Examples:

   - ansible.module_utils.univention.position_base_dn()
   - ansible.module_utils.univention.config_registry()
   - ansible.module_utils.univention.base_dn()
   - ansible.module_utils.univention.config()

* module_utils univention: fix library

* move module_utils from univention to univention_umc, because python import univention fails if library is called univention

* univention_umc: fix intention

* univention: change common code to BSD-2-clause

thaim/ansible,thaim/ansible