exec_init_fn now either returns NULL (success) or a string which indicates
the error that occured during service engine initialization. If an error
occurs, corosync will exit. This patch adds ykd and makes other suggestions
from Fabio Di Nitto.
Signed-off-by: Steven Dake <sdake@redhat.com>
Reviewed-by: Fabio Di Nitto <fdinitto@redhat.com>