Revert "fixed tests for ansible 2.12"

include is deprecated and will be removed in 2.16, so there is some time to fix this left
This reverts commit 19c28b2.

Author: Klaus Zerwes

tests/ansible/all.yml

@@ -1,6 +1,6 @@
-- import_playbook: setup/all.yml
+- include: setup/all.yml
   tags: setup
-- import_playbook: regression/all.yml
+- include: regression/all.yml
   tags: regression
-- import_playbook: integration/all.yml
+- include: integration/all.yml
   tags: integration