resilient: do not search backup.signature in tmp/ folder

if backup.signature is present in tmp/ folder (during push) promise will fail because find return 2 elements and 1 is expected

stack/resilient/buildout.hash.cfg

@@ -26,7 +26,7 @@ md5sum = c6c11db5372150019debb1ce519b907d
 
 [template-pull-backup]
 filename = instance-pull-backup.cfg.in
-md5sum = 9b87abf464abac03801e8c670a09c5d7
+md5sum = e7656ee8b5c8919483d96380833c1b0b
 
 [template-replicated]
 filename = template-replicated.cfg.in

stack/resilient/instance-pull-backup.cfg.in

@@ -289,7 +289,7 @@ template = inline:
   # Error cannot be deduced if files do not exist
   cd $${directory:pbs-backup}
   if [ ! -f "proof.signature" ]; then exit 0; fi
-  backup_signature=$(find . -maxdepth 2 -name backup.signature)
+  backup_signature=$(find . -maxdepth 2 -name backup.signature -not -path "./tmp/*")
   if [ -z "$backup_signature" ]; then
     exit 0;
   else