s3:idmap_tdb2: deprecate the idmap:script parameter and use "idmap config * : script" instead
With this patch, "idmap config * : script" will override "idmap : script".
If "idmap : script" is present, a deprecation warning will be printed in any
case. If "idmap config * : script" is not set, then the value of "idmap :script"
will be used for backwards compatibility.
(cherry picked from commit
b6c82f18f17cdded771d285930566c1d104686aa)
(cherry picked from commit
7812ce547973a0ad5a69c64e8e708e1b9f3a8687)