Fix cctests using Sockets to be able to run in parallel

test/cctest/test-sockets.cc

Index: test/cctest/test-sockets.cc
diff --git a/test/cctest/test-sockets.cc b/test/cctest/test-sockets.cc
index ad7354002ff2bd43863291030e1a3b90e0d37899..2f7941c6ede179c817a3276089d9151c4fdf8625 100644
--- a/test/cctest/test-sockets.cc
+++ b/test/cctest/test-sockets.cc
@@ -124,7 +124,7 @@ static void SendAndReceive(int port, char *data, int len) {
 TEST(Socket) {
   // Make sure this port is not used by other tests to allow tests to run in
   // parallel.
-  static const int kPort = 5859;
+  static const int kPort = 5859 + FlagDependentPortOffset();
 
   bool ok;