test: scale keepalive timeouts for slow machines

The test was using fixed timeouts and that seems to be causing sporadic
test failures on pi1-docker host (which is a very slow machine.)

Fixes: #30828

PR-URL: #30834
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/sequential/test-https-server-keep-alive-timeout.js

@@ -34,13 +34,13 @@ test(function serverKeepAliveTimeoutWithPipeline(cb) {
     common.mustCall((req, res) => {
       res.end();
     }, 3));
-  server.setTimeout(500, common.mustCall((socket) => {
+  server.setTimeout(common.platformTimeout(500), common.mustCall((socket) => {
     // End this test and call `run()` for the next test (if any).
     socket.destroy();
     server.close();
     cb();
   }));
-  server.keepAliveTimeout = 50;
+  server.keepAliveTimeout = common.platformTimeout(50);
   server.listen(0, common.mustCall(() => {
     const options = {
       port: server.address().port,
@@ -57,13 +57,13 @@ test(function serverKeepAliveTimeoutWithPipeline(cb) {
 
 test(function serverNoEndKeepAliveTimeoutWithPipeline(cb) {
   const server = https.createServer(serverOptions, common.mustCall(3));
-  server.setTimeout(500, common.mustCall((socket) => {
+  server.setTimeout(common.platformTimeout(500), common.mustCall((socket) => {
     // End this test and call `run()` for the next test (if any).
     socket.destroy();
     server.close();
     cb();
   }));
-  server.keepAliveTimeout = 50;
+  server.keepAliveTimeout = common.platformTimeout(50);
   server.listen(0, common.mustCall(() => {
     const options = {
       port: server.address().port,