ggsn: Rename diameter generic ports to Gx

We'll start emulating other Diameter-based interfaces soon (Gy), so
let's rename existing stuff which is Gx specific.
The DIAMETER_Emulation only supports handling 1 application-id per
component, and that's fine anyway since the OCS is in general expected
to run in a different conn/node from PCRF.

Change-Id: I1eb03d907b46c4bb24491f390ef468e831190e08
1 file changed