Changes

jobs/ttcn3: update ttcn3-ggsn-test-kernel

Remove ttcn3-ggsn-test-kernel-pablo-gtp, as the IPv6 GTP patches have
been merged. Add ttcn3-ggsn-test-kernel-net-next and
ttcn3-ggsn-test-kernel-torvalds instead, which run the master/nightly
version of osmo-ggsn against HEAD of the kernel trees in
netdev/net-next and torvalds/linux.

Change-Id: I3d2f26ca87f79365f4a407376b5c3c0145f729a6