tests: replace most g_print() with g_printerr()

I searched all files that mention g_test_run, and replaced most
g_print() calls. This avoids interfering with TAP. Exceptions:

* gio/tests/network-monitor: a manual mode that is run by
  "./network-monitor --watch" is unaffected
* glib/gtester.c: not a test
* glib/gtestutils.c: not a test
* glib/tests/logging.c: specifically exercising g_print()
* glib/tests/markup-parse.c: a manual mode that is run by
  "./markup-parse --cdata-as-text" is unaffected
* glib/tests/testing.c: specifically exercising capture of stdout
  in subprocesses
* glib/tests/utils.c: captures a subprocess's stdout
* glib/tests/testglib.c: exercises an assertion failure in g_print()

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=725981
Reviewed-by: Colin Walters <walters@verbum.org>
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

gio/tests/gdbus-test-codegen.c

@@ -1572,7 +1572,7 @@ om_on_signal (GDBusConnection *connection,
     {
     default:
     case 0:
-      g_print ("failing and om_data->state=%d on signal %s, params=%s\n",
+      g_printerr ("failing and om_data->state=%d on signal %s, params=%s\n",
                om_data->state,
                signal_name,
                g_variant_print (parameters, TRUE));