Fix older version of SSL (#24)

* Add manual locking callback for SSL

Co-authored-by: Antonio Andelic <antonio.andelic@memgraph.io>

tests/integration/ldap/tester.cpp

@@ -25,7 +25,7 @@ int main(int argc, char **argv) {
   gflags::ParseCommandLineFlags(&argc, &argv, true);
   google::InitGoogleLogging(argv[0]);
 
-  communication::Init();
+  communication::SSLInit sslInit;
 
   io::network::Endpoint endpoint(io::network::ResolveHostname(FLAGS_address),
                                  FLAGS_port);