fix 'sh vxlan tunnels'
fix 'sh vxlan tunnels'

this receipe:
  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;
only works if there is more data following the registered command name.
So it is not so good for show commands...

Change-Id: I54249865a44526ade4b40e2d6207138a2d056e40
Signed-off-by: Neale Ranns <7d187a79c6b4bf1b7a865a4d130ff0038bf5d84b@cisco.com>

FDio/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp