doc: Update INSTALL file

• Add LibQB and Knet links
• Remove old (pre udpu) config file example
• Change corosync.conf man page to contain useful information about

token timeout

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>