test: fallback to IPv4 if IPv6 is unavailable

openssl seems to default to use IPv6.
This change adds a check for IPv6 is unavailable and uses IPv4 instead.
On the Node.js CI IBM i build system IPv6 is currently disabled.
This change should resolve the following test case failures:
- https://ci.nodejs.org/job/node-test-commit-ibmi/nodes=ibmi73-ppc64/1085/testReport/(root)/test/sequential_test_tls_psk_client_/
- https://ci.nodejs.org/job/node-test-commit-ibmi/nodes=ibmi73-ppc64/1085/testReport/(root)/test/sequential_test_tls_securepair_client_/

test/sequential/test-tls-psk-client.js

@@ -6,6 +6,8 @@ if (!common.hasCrypto)
 if (!common.opensslCli)
   common.skip('missing openssl cli');
 
+const useIPv4 = common.hasIPv6 ? false : true;
+
 const assert = require('assert');
 const tls = require('tls');
 const net = require('net');
@@ -23,6 +25,7 @@ const server = spawn(common.opensslCli, [
   '-psk_hint', IDENTITY,
   '-nocert',
   '-rev',
+  ...(useIPv4 ? ['-4'] : []),
 ], { encoding: 'utf8' });
 let serverErr = '';
 let serverOut = '';

test/sequential/test-tls-securepair-client.js

@@ -32,6 +32,8 @@ if (!common.hasCrypto)
 if (common.isWindows)
   common.skip('test does not work on Windows'); // ...but it should!
 
+const useIPv4 = common.hasIPv6 ? false : true;
+
 const net = require('net');
 const assert = require('assert');
 const fixtures = require('../common/fixtures');
@@ -64,7 +66,9 @@ function test(keyPath, certPath, check, next) {
   const server = spawn(common.opensslCli, ['s_server',
                                            '-accept', 0,
                                            '-cert', fixtures.path(certPath),
-                                           '-key', fixtures.path(keyPath)]);
+                                           '-key', fixtures.path(keyPath),
+                                           ...(useIPv4 ? ['-4'] : []),
+                                          ]);
   server.stdout.pipe(process.stdout);
   server.stderr.pipe(process.stdout);