Fix unit test relative imports, and permissions for included collection requirements (#29)

* Fix Hetzner firewall unit test imports.

* Make sure tests can actually access collections.

* Fix more relative imports.

* Fix more relative imports.

* Fix more includes.

* Fix more tests.

* One more.

* Fix syntax error in sanity import tests (invalid escape sequence "\$" caused by non-raw docs block)

* Fix permissions of ansible-test parts for sanity tests.

* Revert "Fix permissions of ansible-test parts for sanity tests."

This reverts commit c2713f0a12.

plugins/modules/cloud/univention/udm_user.py

@@ -14,7 +14,7 @@ ANSIBLE_METADATA = {'metadata_version': '1.1',
                     'supported_by': 'community'}
 
 
-DOCUMENTATION = '''
+DOCUMENTATION = r'''
 ---
 module: udm_user
 author: