check_ntp: check if array has been passed and only select the first one

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>
checkntp: actually check first ntp_server entry if array

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>
Add missing hostname to checktotalprocs plugins

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>
Add max_check_attempts to checktotalprocs plugin

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>