tests: Rename wayland-test to weston-test

wayland-test isn't and will never be wayland protocol, it's weston internal.

Renamed wayland-test to weston-test, and wl_test to weston_test.

Also added a Big Fat Warning to the description of weston_test to try to
keep people from thinking it's a good idea to use some of these functions
outside of testing.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Acked-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
diff --git a/tests/event-test.c b/tests/event-test.c
index b60ad85..43540a5 100644
--- a/tests/event-test.c
+++ b/tests/event-test.c
@@ -59,7 +59,7 @@
 static void
 check_pointer_move(struct client *client, int x, int y)
 {
-	wl_test_move_pointer(client->test->wl_test, x, y);
+	weston_test_move_pointer(client->test->weston_test, x, y);
 	client_roundtrip(client);
 	check_pointer(client, x, y);
 }