Disable measurement timing rules on sbws by default
Currently sbws include less relays in its report, mostly due to https://trac.torproject.org/projects/tor/ticket/27338#comment:6.
While sbws is not changed to include more relays, maybe the notice message about
"Bandwidth authorities have a substantially different number of measured entries" should not be sent.
sbws should disable these restrictions, so it matches torflow.