Added a test to check for working NIS broadcast discovery

Signed-off-by: Olaf Kirch <okir@suse.de>
Renamed README.md to README

Signed-off-by: Olaf Kirch <okir@suse.de>
When the broadcast test fails, run systemctl status ypbind.service to display the status

Signed-off-by: Olaf Kirch <okir@suse.de>