clippy implied_bounds_in_impls - suppress globally?

Current nightly produces a lot of these:

warning: this bound is already specified as the supertrait of `DoubleEndedIterator`
   --> crates/tor-dirmgr/src/event.rs:526:32
    |
526 |     fn statuses(&self) -> impl Iterator<Item = &DirStatus> + DoubleEndedIterator {
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#implied_bounds_in_impls
note: the lint level is defined here
   --> crates/tor-dirmgr/src/lib.rs:9:9
    |
9   | #![warn(clippy::all)]
    |         ^^^^^^^^^^^
    = note: `#[warn(clippy::implied_bounds_in_impls)]` implied by `#[warn(clippy::all)]`
help: try removing this bound
    |
526 -     fn statuses(&self) -> impl Iterator<Item = &DirStatus> + DoubleEndedIterator {
526 +     fn statuses(&self) -> impl DoubleEndedIterator<Item = &DirStatus> {

I disagree with this lint, at least in this case. All the existing cases in our codebase are just like this, with Iterator. I prefer the Iterator + ExtraUsefulIterator phrasing.

In my clippy fixes MR, I'm going to add suppressions at each site. But, I think we should add this to our global list of lint suppressions.