shared: in signature file, save non-ascii chars as utf-8 rather than JSON-escaped

slapos/recipe/__init__.py

@@ -115,7 +115,7 @@ class Shared(object):
               if profile_base_location else v)
           for k, v in options.items()
           if k != '_profile_base_location_'
-        }, indent=0, sort_keys=True)
+        }, ensure_ascii=False, indent=0, sort_keys=True)
         if not isinstance(signature, bytes): # BBB: Python 3
           signature = signature.encode()
         digest = md5(signature).hexdigest()