Include FTE in userstats-bridge-transport

Kevin's FTE bridge has started publishing stats:

bridge-ips cn=8,gr=8,it=8,ro=8,ru=8,sk=8,tr=8,us=8
bridge-ip-versions v4=32,v6=0
bridge-ip-transports fte=32

It would be nice if we could monitor the deployment of FTE by looking at https://metrics.torproject.org/users.html#userstats-bridge-transport

Can we include the FTE transport in those graphs?

I can try to work out a patch for this in the next days. Shouldn't be too hard. Thanks!

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