* Move ansible.compat.tests to test/units/compat/.
* Fix unit test references to ansible.compat.tests.
* Move builtins compat to separate file.
* Fix classification of test/units/compat/ dir.
Move dict_merge from azure_rm_resource module to
module_utils.common.dict_transformations and add tests.
Use dict_merge to provide a fairly realistic, reliable
diff output when k8s-based modules are run in check_mode.
Rename unit tests so that they actually run and reflect
the module_utils they're based on.
