Auto merge of #7345 - DevinR528:disallowed-fix, r=Manishearth

Remove requirement of fully qualified path for disallowed_method/type

changelog: Remove the need for fully qualified paths in disallowed_method and disallowed_type

After fixing this issue in [import_rename](https://github.com/rust-lang/rust-clippy/pull/7300#discussion_r650127720) I figured I'd fix it for these two.

If this does in fact fix the **Known problems:** section I was planning to remove them from both lints after confirmation.