Meraki IPv6 Support

[K6USY]

I have been working with Cisco Meraki on a beta firmware that adds IPv6 support to their access points. 

So far the APs can get an IPv6 address and DNS servers via router advertisements.  They currently do not support DHCPv6 at all so that cannot be used with the other-config-flag for DNS and domain information.  Once the AP has an IPv6 address it is able to contact their servers over IPv6; it will also work on an IPv6 only network.  They have also added the ability to add IPv6 firewall rules.  Currently they are working on a issue I found with doing RADIUS over IPv6. Hopefully once all these backed services work they can start adding the ability to offer IPv6 addresses to clients that are not on an SSID in bridge mode.