shared: fix trailing whitespace in signature file on Python 2

slapos/recipe/__init__.py

@@ -105,7 +105,9 @@ class Shared(object):
               if profile_base_location else v)
           for k, v in options.items()
           if k != '_profile_base_location_'
-        }, ensure_ascii=False, indent=2, sort_keys=True)
+        }, ensure_ascii=False, indent=2, sort_keys=True,
+          # BBB: Python 2 ( https://bugs.python.org/issue16333 )
+          separators=(',', ': '))
         if not isinstance(signature, bytes): # BBB: Python 3
           signature = signature.encode()
         digest = md5(signature).hexdigest()