networkd: dhcp-server - default to manage the whole subnet

Don't restrict yourselves to 32 leases, simply manage the whole subnet by default.

src/network/networkd-link.c

@@ -741,8 +741,8 @@ static int link_enter_set_addresses(Link *link) {
                         return 0;
                 }
 
-                /* offer 32 addresses starting from the address following the server address */
-                r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen, 0, 32);
+                /* use the server address' subnet as the pool */
+                r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen, 0, 0);
                 if (r < 0)
                         return r;