quorum: revert patch that adds qdevice (node 0) to quorum callback

Revert patch 9f54f0a1fad7dad42c55562a50dfb9d773e6a660 as it causes
more troubles than it solves. Code that uses the quorum nodelist
to get a list of actual nodes in the cluster for communication
break using this as well as the display from corosync-quorumtool

Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>