Fixed up internal 'g_test*' names.

Fixed up internal 'g_test*' names.

* refcount/signals.c:
* refcount/objects.c:
* refcount/objects2.c:
* refcount/closures.c:
* refcount/properties.c:
* refcount/properties2.c: changed namespace prefix from g_test_* to my_test_*
to not clash with newly introduced g_test* API in glib.

svn path=/trunk/; revision=5875