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/button-test.c b/tests/button-test.c
index a784258..7959fb7 100644
--- a/tests/button-test.c
+++ b/tests/button-test.c
@@ -39,18 +39,18 @@
 	assert(pointer->button == 0);
 	assert(pointer->state == 0);
 
-	wl_test_move_pointer(client->test->wl_test, 150, 150);
+	weston_test_move_pointer(client->test->weston_test, 150, 150);
 	client_roundtrip(client);
 	assert(pointer->x == 50);
 	assert(pointer->y == 50);
 
-	wl_test_send_button(client->test->wl_test, BTN_LEFT,
+	weston_test_send_button(client->test->weston_test, BTN_LEFT,
 			    WL_POINTER_BUTTON_STATE_PRESSED);
 	client_roundtrip(client);
 	assert(pointer->button == BTN_LEFT);
 	assert(pointer->state == WL_POINTER_BUTTON_STATE_PRESSED);
 
-	wl_test_send_button(client->test->wl_test, BTN_LEFT,
+	weston_test_send_button(client->test->weston_test, BTN_LEFT,
 			    WL_POINTER_BUTTON_STATE_RELEASED);
 	client_roundtrip(client);
 	assert(pointer->button == BTN_LEFT);