suppress interrupt trace from SIGTERM test

test/distributed_exec.jl

@@ -1920,6 +1920,8 @@ begin
  remote_do(w) do
  # Cause the 'exit()' message that `rmprocs()` sends to do nothing
  Core.eval(Base, :(exit() = nothing))
+ # Hide the trace that `rmprocs()` will cause this worker to show
+ redirect_stderr(devnull)
  end
  wait(rmprocs([w]))
  end