Tests print their name before running

This makes finding out which test have hung-up easier.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

tests/test_pair_tcp.cpp

@@ -20,10 +20,13 @@
 */
 
 #include <assert.h>
+#include <stdio.h>
 #include "testutil.hpp"
 
 int main (int argc, char *argv [])
 {
+    fprintf (stderr, "test_pair_tcp running...\n");
+
     void *ctx = zmq_init (1);
     assert (ctx);