ttcn3-ggsn-test: run with multiple configurations

The kernel ttcn3-ggsn-tests have been failing since the osmo-ggsn
config for kernel-gtp has been adjusted for v4v6 instead of v4 only.

This new configuration caused a regression with:
* linux kernel without Pablo's GTP IPv6 patches
* latest stable release of osmo-ggsn, which does not support IPv6

As the kernel patches aren't merged yet, this caused all tests to fail.

Avoid this by running the ttcn3-ggsn-test with multiple configurations:
* v4_only: one APN with v4
* v6_only: one APN with v6
* v4v6_only: one APN with v4v6
* all: multiple APNs with all of the above

With this change, the tests running in the v4_only configuration will
pass again with the stable versions of osmo-ggsn, libgtpnl and kernel.
And with new versions, most test in the other configurations will pass
too.

As discussed with Harald, this does not only split up the configuration
for osmo-ggsn with kernel gtp-u, but also with the userspace
implementation. The "all" config currently only works with the
userspace gtp implementation (OS#6106).

Related: OS#6096
Depends: osmo-ttcn3-hacks I6d94a8b18200fbb2119406827b74b83e912e3ecc
Fixes: e24442f9 ("ttcn3-ggsn-test: kernel-gtp: add ipv6")
Change-Id: Ia2fe0c3ed4ccf06e72fd258d085e4a79cecd5f26
---
M ttcn3-ggsn-test/Dockerfile
M ttcn3-ggsn-test/jenkins.sh
C ttcn3-ggsn-test/osmo-ggsn-kernel/v4_only/osmo-ggsn.cfg
R ttcn3-ggsn-test/osmo-ggsn-kernel/v4v6_only/osmo-ggsn.cfg
C ttcn3-ggsn-test/osmo-ggsn-kernel/v6_only/osmo-ggsn.cfg
R ttcn3-ggsn-test/osmo-ggsn/all/osmo-ggsn.cfg
C ttcn3-ggsn-test/osmo-ggsn/v4_only/osmo-ggsn.cfg
C ttcn3-ggsn-test/osmo-ggsn/v4v6_only/osmo-ggsn.cfg
A ttcn3-ggsn-test/osmo-ggsn/v6_only/osmo-ggsn.cfg
R ttcn3-ggsn-test/ttcn3/all/GGSN_Tests.cfg
C ttcn3-ggsn-test/ttcn3/v4_only/GGSN_Tests.cfg
C ttcn3-ggsn-test/ttcn3/v4v6_only/GGSN_Tests.cfg
C ttcn3-ggsn-test/ttcn3/v6_only/GGSN_Tests.cfg
13 files changed, 170 insertions(+), 71 deletions(-)