setup: Don’t fail cleanup on empty remote engine environment

When engine-setup fails on dnf repositories download, the followup
cleanup fails with

[ ERROR ] Failed to execute stage 'Clean up': 'NoneType' object has no attribute 'cleanup'

This patch moves the corresponding cleanup call from STAGE_CLEANUP to
STAGE_CLOSEUP.  STAGE_CLOSEUP only runs if we didn't fail and runs
non-critical stuff that we can't, or don't want to, rollback.

packaging/setup/plugins/ovirt-engine-common/base/remote_engine/remote_engine.py

@@ -65,7 +65,7 @@ def _setup(self):
         ] = remote_engine.RemoteEngine(plugin=self)
 
     @plugin.event(
-        stage=plugin.Stages.STAGE_CLEANUP,
+        stage=plugin.Stages.STAGE_CLOSEUP,
     )
     def _cleanup(self):
         self.environment[