refactor: minor modification to the workload generator for sdam_viz

Author: mbroadst

test/tools/sdam_viz

@@ -90,11 +90,7 @@ async function run() {
   await client.connect();
 
   if (argv.workload) {
-    for (;;) {
-      if (workloadInterrupt) {
-        return;
-      }
-
+    while (!workloadInterrupt) {
       await wait(2000);
 
       try {

test/unit/sdam/server_selection/select_servers_tests.js

@@ -20,9 +20,9 @@ describe('selectServers', function() {
   it('should error immediately if timeout exceeds start time', function(done) {
     const topology = new Topology('invalid:27019');
     const start = process.hrtime();
-    start[0] = start[0] - 500;
+    start[0] = start[0] - 1;
 
-    selectServers(topology, ReadPreference.primary, 500, start, err => {
+    selectServers(topology, ReadPreference.primary, 1000, start, err => {
       expect(err).to.exist;
       done();
     });