Refactor yum_repository, deprecate yum only options

changelogs/fragments/yum_repository.yml

@@ -0,0 +1,9 @@
+deprecated_features:
+ - yum_repository - deprecate ``async`` option as it has been removed in RHEL 8 and will be removed in ansible-core 2.22.
+ - >-
+ yum_repository - the following options are deprecated: ``deltarpm_metadata_percentage``, ``gpgcakey``, ``http_caching``,
+ ``keepalive``, ``metadata_expire_filter``, ``mirrorlist_expire``, ``protect``, ``ssl_check_cert_permissions``,
+ ``ui_repoid_vars`` as they have no effect for dnf as an underlying package manager.
+ The options will be removed in ansible-core 2.22.
+minor_changes:
+ - yum_repository - add ``excludepkgs`` alias to the ``exclude`` option.