test: fix test-tls-getcipher

The test blindly assumes that the default cipher suite supports RC4
ciphers. This corrects the case where RC4 might not be available in the
default ciphers by setting the client to use the same suite as the
server.

test/parallel/test-tls-getcipher.js

@@ -25,6 +25,7 @@ server.listen(common.PORT, '127.0.0.1', function() {
   var client = tls.connect({
     host: '127.0.0.1',
     port: common.PORT,
+    ciphers: cipher_list.join(':'),
     rejectUnauthorized: false
   }, function() {
     var cipher = client.getCipher();