Feature: various: Drop support for restart-type resource meta-attribute

It is undocumented, deprecated (with a warning), and somewhat replaced
with kind (see
https://www.mail-archive.com/linux-ha@lists.linux-ha.org/msg08220.html).

This is already disallowed by the schema.

Closes T280

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>