'Enables notifications for a particular service.
Note that this does not enable notifications for the host.
Syntax: ENABLE_SVC_NOTIFICATIONS;<host_name>;<service_description>'

def enable_svc_notifications(self, host, services=None):

    cmd = 'ENABLE_SVC_NOTIFICATIONS'
    if (services is None):
        services = []
    nagios_return = True
    return_str_list = []
    for service in services:
        notif_str = self._fmt_notif_str(cmd, host, svc=service)
        nagios_return = (self._write_command(notif_str) and nagios_return)
        return_str_list.append(notif_str)
    if nagios_return:
        return return_str_list
    else:
        return 'Fail:    could    not    write    to    the    command    file'
