The traffic sync's call that drops online sets of nodes it no longer
fetches had no test: a job-package test cannot install an xray process,
so online state was invisible there and removing the call passed.
SetXrayProcessForTest installs a test process for tests in other packages,
the same kind of seam as Manager.SetRuntimeOverride. The new job test runs
a real tick with a disabled node and a deleted one and fails without the
call.
Sanaei