kvm: fixup resilience import script

  This diff don't cause error since bash isn't run with -e but makes write_backup_proof useless basically.

software/kvm/buildout.hash.cfg

@@ -35,7 +35,7 @@ md5sum = a463a5e3cd2287d275d6943c2a11b7e4
 
 [template-kvm-import-script]
 filename = template/kvm-import.sh.jinja2
-md5sum = cd0008f1689dfca9b77370bc4d275b70
+md5sum = e95b7e827179d1cf6fa998c4535f8cd8
 
 [template-kvm-export]
 filename = instance-kvm-export.cfg.jinja2

software/kvm/template/kvm-import.sh.jinja2

@@ -10,7 +10,7 @@ umask 077
 write_backup_proof () {
   cd {{ directory['backup'] }}
   find -type f ! -name backup.signature ! -wholename "./rdiff-backup-data/*" -print0 | xargs -0 sha256sum  | LC_ALL=C sort -k 66 > {{ directory['srv'] }}/proof.signature
-  diff -ruw {{ directory['backup'] }} {{ directory['srv'] }}/proof.signature > {{ directory['srv'] }}/backup.diff
+  diff -ruw {{ directory['backup'] }}/backup.signature {{ directory['srv'] }}/proof.signature > {{ directory['srv'] }}/backup.diff
 }
 
 # For now we just make the diff before