test_automatic_host_removal: Improve teardown process

Include explicit hosts' removal within the test's teardown in case
something goes wrong within the automatic hosts' removal.

Change-Id: Ia5e7b45bc57bf9c6d1657bc91c3a80998148a7c2

tests/composition/test_automatic_host_removal.py

@@ -75,4 +75,8 @@ def _host_removal_done() -> bool:
         raise
     finally:
         central_site.openapi.rules.delete(rule_id=rule_id)
+        if unresolvable_host_central in [_.get("id") for _ in central_site.openapi.hosts.get_all()]:
+            central_site.openapi.hosts.delete(unresolvable_host_central)
+        if unresolvable_host_remote in [_.get("id") for _ in remote_site.openapi.hosts.get_all()]:
+            remote_site.openapi.hosts.delete(unresolvable_host_remote)
         central_site.openapi.activate_changes_and_wait_for_completion(force_foreign_changes=True)