Feature: schemas: Disallow ping nodes

Ping nodes have been deprecated since 2.1.3. See commit 1478ee54 for
more details.

This commit also transforms ping nodes in existing CIBs to cluster nodes
with all resources banned from them and resource probes disabled. The
generated location constraints have XML IDs of the form
"pcmk__3_10_upgrade-ping-node-ban-<node_name>".

Closes T821

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