Remove DHCP-block from interface "client"

For parker we need DHCP on the client interface. Ths rule
prevents us from doing so.
In addition: make sure old rules will be deleted on upgrade.

package/gluon-client-bridge/luasrc/lib/gluon/upgrade/300-gluon-client-bridge-network

@@ -64,10 +64,7 @@ uci:set('dhcp', dnsmasq, 'rebind_protection', false)
 uci:delete('dhcp', 'client')
 uci:delete('firewall', 'local_node')
 
-uci:section('dhcp', 'dhcp', 'local_client', {
-	interface = 'client',
-	ignore = true,
-})
+uci:delete('dhcp', 'local_client')
 
 uci:save('dhcp')
 uci:save('firewall')