Add a copy of osmo-ggsn.cfg, with gtpu-mode set to kernel-gtp and apn
inet6 and inet46 removed (as the kernel module only supports ipv4).
Related: OS#3209
Change-Id: I6fbe8a8e55bad41532e9aed3cf71ebebffdcee52
Osmocom has maintained this program since about 7 years now, while
the original author / copyright holder has completely disappeared.
With the introduction of Osmocom-style CTRL and VTY interfaces,
the way how the program is used and configured has substantially
changed. In order to avoid confusion in terms of configuration file
format etc, let's rename it to OsmoGGSN.
Change-Id: I2da30f7d4828e185bfac1a4e2d8414b01cbe4f9d
Oliver Smith
Harald Welte