Fix look-up of GTP tunnel by TEI

I can't look tei by gtp-tunnel in GTPv1.
I write patch for libgtpnl.

head version

$./tools/gtp-tunnel add hoge v1 65535 65535 10.0.3.2 192.168.0.2
$./tools/gtp-tunnel list
version 1 tei 0/0 ms_addr 10.0.3.2 sgsn_addr 192.168.0.2

fixed version

$./tools/gtp-tunnel add hoge v1 65535 65535 10.0.3.2 192.168.0.2
$./tools/gtp-tunnel list
version 1 tei 65535/65535 ms_addr 10.0.3.2 sgsn_addr 192.168.0.2
1 file changed