calling: update TurnCallRouter to shuffle instance IPs to prevent allocation skew

Co-authored-by: Jonathan Klabunde Tomer <125505367+jkt-signal@users.noreply.github.com>

service/src/test/java/org/whispersystems/textsecuregcm/calls/routing/TurnCallRouterTest.java

@@ -108,7 +108,9 @@ public class TurnCallRouterTest {
         () -> performanceTable,
         () -> manualTable,
          configTurnRouter,
-        () -> geoIp
+        () -> geoIp,
+        // set to true so the return values are predictable
+        true
     );
   }