osmo-gsm-tester: Add 3g support with nano3G board
- Build osmo-msc with "--enable-iu"
- Build osmo-sgsn with "--enable-iu"
- Configure nano3G
- Add OsmoHnbgw class
- Add 3g feature to modems
- See if 2g tests can be reused only changing the scenario
- Add contrib script to build osmo-iuh
- Add jenkins job to run contrib/ jenkins-build-osmo-iuh.sh, update run jobs to take the artifact