[j-nsp] QFX10k8 GRE tunnels

[Brian Rak]

Is anyone successfully using GRE tunnels on a QFX10008 running 17.4?

I configured one, and traffic works normally from the control plane, 
however data plane traffic seems to just get dropped.

So, ping from the router itself works fine, but it won't actually route 
any other traffic over the tunnel.

`show interfaces gr-0/0/0.0` shows that it's attempting to output 
packets, but they never actually arrive at the remote end of the tunnel.