Move all our tests back to ui tests

tests/ui/useless_attribute.rs

@@ -0,0 +1,17 @@
+#![feature(plugin)]
+#![plugin(clippy)]
+#![warn(useless_attribute)]
+
+#[allow(dead_code)]
+extern crate clippy_lints;
+
+// don't lint on unused_import for `use` items
+#[allow(unused_imports)]
+use std::collections;
+
+// don't lint on deprecated for `use` items
+mod foo { #[deprecated] pub struct Bar; }
+#[allow(deprecated)]
+pub use foo::Bar;
+
+fn main() {}