test: reduce test-benchmark-net run duration

Set configuration option to reduce combinations of benchmark settings
tried in test, reducing execution time by about 50%.

PR-URL: #14183
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

test/sequential/test-benchmark-net.js

@@ -15,7 +15,11 @@ const path = require('path');
 
 const runjs = path.join(__dirname, '..', '..', 'benchmark', 'run.js');
 
-const child = fork(runjs, ['--set', 'dur=0', 'net'],
+const child = fork(runjs,
+                   ['--set', 'dur=0',
+                    '--set', 'len=1024',
+                    '--set', 'type=buf',
+                    'net'],
                    {env: {NODEJS_BENCHMARK_ZERO_ALLOWED: 1}});
 child.on('exit', (code, signal) => {
   assert.strictEqual(code, 0);