'Enables notifications for all services that are associated
with hosts in a particular hostgroup.
Note that this does not enable notifications for the hosts in
this hostgroup.
Syntax: ENABLE_HOSTGROUP_SVC_NOTIFICATIONS;<hostgroup_name>'

def enable_hostgroup_svc_notifications(self, hostgroup):

    cmd = 'ENABLE_HOSTGROUP_SVC_NOTIFICATIONS'
    notif_str = self._fmt_notif_str(cmd, hostgroup)
    nagios_return = self._write_command(notif_str)
    if nagios_return:
        return notif_str
    else:
        return 'Fail:    could    not    write    to    the    command    file'
