test: remove test case 0 from tls-cnnic-whitelist

I looks like this test has not worked as expected since commit
2bc7841 ("test: use random ports
where possible"). The test in that commit checked for `CERT_REVOKED`
which was returned by CheckWhitelistedServerCert.

CheckWhitelistedServerCert was later removed in commit
dc87543 ("src: drop CNNIC+StartCom
certificate whitelisting").

I'm suggesting that this test case be removed as I don't think it is
valid anymore.

test/parallel/test-tls-cnnic-whitelist.js

@@ -14,22 +14,6 @@ function loadPEM(n) {
 }
 
 const testCases = [
-  { // Test 0: for the check of a cert not in the whitelist.
-    // agent7-cert.pem is issued by the fake CNNIC root CA so that its
-    // hash is not listed in the whitelist.
-    // fake-cnnic-root-cert has the same subject name as the original
-    // rootCA.
-    serverOpts: {
-      key: loadPEM('agent7-key'),
-      cert: loadPEM('agent7-cert')
-    },
-    clientOpts: {
-      port: undefined,
-      rejectUnauthorized: true,
-      ca: [loadPEM('fake-cnnic-root-cert')]
-    },
-    errorCode: 'CERT_HAS_EXPIRED'
-  },
   // Test 1: for the fix of node#2061
   // agent6-cert.pem is signed by intermediate cert of ca3.
   // The server has a cert chain of agent6->ca3->ca1(root) but