Removing debug output of 51-hosts

This floods the logs for no real value added.

Change-Id: I88eb15289415ccb227365bd3ddfed024469106e2
Closes-bug: #1872528
(cherry picked from commit 5ed09ac4e7)

elements/hosts/os-refresh-config/configure.d/51-hosts

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-set -eux
+set -eu
 set -o pipefail
 
 write_entries() {