Fabio does not advertise http/1.1 on TLS connections

[magiconair]

@hkolk found this:

# start consul (sep term)
consul agent -server -dev

# start fabio with a cert store (sep term)
./fabio -proxy.cs 'cs=tls;type=path;cert=demo/cert/server' -proxy.addr ':9443;cs=tls'

# determine protocol
openssl s_client -nextprotoneg 'spdy3,http/1.1' -servername www.server.com -connect localhost:9443
...
Protocols advertised by server: h2
...
Next protocol: (2) spdy3

This seems to cause a broken TLS handshake with Safari on OS X 10.10 and maybe others.