'set global EVPN configration'

def config_evnp_global(self):

    if (not self.conf_exist):
        if (self.overlay_enable == 'enable'):
            self.cli_add_command('evpn-overlay    enable')
        else:
            self.cli_add_command('evpn-overlay    enable', True)
        if self.commands:
            self.cli_load_config(self.commands)
            self.changed = True
