corosync-quorumtool: add sort options

Adds a -o<a|i|n> option to corosync-votequorum so that the nodes list
can be sorted by Address, node Id or Name. The default remains IP
address.

Signed-Off-By: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>