Fix OSError in postprocess

Wrong order of clearing LibvirtdDebugLogConfig causes OSError.

Signed-off-by: lcheng <[email protected]>

virttest/env_process.py

@@ -1759,6 +1759,8 @@ def postprocess(test, params, env):
                 err += "\nPolkit cleanup: %s" % str(details).replace("\\n", "\n  ")
                 LOG.error("Unexpected error: %s" % details)
 
+    err += "\n".join(_setup_manager.do_cleanup())
+
     # Execute any post_commands
     if params.get("post_command"):
         try:
@@ -1790,8 +1792,6 @@ def postprocess(test, params, env):
         except exceptions.TestFail as details:
             err += "\nHost dmesg verification failed: %s" % details
 
-    err += "\n".join(_setup_manager.do_cleanup())
-
     # Run this hook after any vms are actually off to ensure data is
     # written to disk.
     if callable(postprocess_vm_off_hook):