pylint: Ignore consider-using-f-string.

Newer versions of pylint warns about not using f-strings, but those are
not supported in Python 2, which ansible-freeipa still need to support.

setup.cfg

@@ -34,6 +34,7 @@ ignore = D1,D212,D203
 
 [pylint.MASTER]
 disable =
+    consider-using-f-string,  # f-string is not supported on Python2
     unspecified-encoding, # open() does not provide `encoding` in Python2
     use-maxsplit-arg,
     redundant-u-string-prefix,