init: major cleanup

• rename generic.in and notifyd.in to corosync.in and corosync-notifyd.in (makes build simpler)
• fix sysvinit corosync.in sleep time to include a check for when IPC are ready and drop cman bits (there is no cman with corosync 2.0)
• corosync-notifyd.service should always start after corosync.service
• corosync.service should always start after network
• corosync.service uses init script wrapper
• install/ship sysvinit as wrappers for systemd in /usr/share/corosync when necessary
• change the build system to deal with all of the above

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