The number of builders connected to the OBS server seems to fluctuate a
bit (used to be 14, then 17 now 16). Make sure that we have at least 10
builders connected. Fix that the test didn't exit with 1 on error.
Related: https://obs.osmocom.org/monitor
Change-Id: Iedd506601a5450550e21bf701309b4ea79a3d897
Add a job that checks if the amount of connected builders to the OBS
server matches what we expect. This should prevent what we had today,
that it only was noticed by chance several days after all builders
failed to connect and the packages were outdated since then.
I'm not sure if there is a proper api to do this check, but I don't
expect the string we check for to change often so this should work fine.
Change-Id: I6e7c1f206551722d6bfe1631b9c1da8d34d85ba8