Updates for VOLTHA 2.8

- Update jobs to 2.8 and master versions
- Add Radisys RTL-3200G, RTL-1600G, RTL-1600X OLTs
- Fix Makefile issues (wasn't creating jobs dir)

Change-Id: I6f3cb1ecff4a42b21368951101acb002c0799780
2 files changed