jenkins: fix build of osmo-sgsn: use osmo-ggsn

osmo-sgsn change-id I91a126952ae75ae9ba1f42aac4d26413384bba5d and commit
a3b73e917b653d13d027cff2c95a56bbc1264446 has broken compatibility with
openggsn.git, by requiring current osmo-ggsn version (1.0.0).

Fix build fallout: use osmo-ggsn instead of openggsn.git.

Change-Id: I5161983ef625465e21b95578ab5648ecc73d6069
1 file changed