test: remove uses of common.PORT in test-tls-client tests

Change common.PORT to '0' to avoid the possibility of getting EADDRINUSE error
if another test in 'parallel' uses port '0' at the same time.

PR-URL: nodejs/node#12461
Ref: nodejs/node#12376
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

test/parallel/test-tls-client-abort.js

@@ -14,9 +14,7 @@ const path = require('path');
 const cert = fs.readFileSync(path.join(common.fixturesDir, 'test_cert.pem'));
 const key = fs.readFileSync(path.join(common.fixturesDir, 'test_key.pem'));
 
-const conn = tls.connect({cert: cert, key: key, port: common.PORT}, function() {
-  assert.ok(false); // callback should never be executed
-});
+const conn = tls.connect({cert, key, port: 0}, common.mustNotCall());
 conn.on('error', function() {
 });
 assert.doesNotThrow(function() {

test/parallel/test-tls-client-abort2.js

@@ -8,7 +8,7 @@ if (!common.hasCrypto) {
 }
 const tls = require('tls');
 
-const conn = tls.connect(common.PORT, common.mustNotCall());
+const conn = tls.connect(0, common.mustNotCall());
 conn.on('error', common.mustCall(function() {
   assert.doesNotThrow(function() {
     conn.destroy();