… deletion

Add `Done()` method that blocks until the `Run()` method finishes its course.

`Run()` is supposed to be executed in a goroutine, and since we can't control the scheduler it might be scheduled *after* the `main` one exits, leading to the `ctx.Done()` code path to never be executed.

Add `Done()`, caller can block on untile `Run()` finishes its execution.

Callers must cancel the `Run()` context, then call `Done()`.

Also modifies the DKG run test to check that all privkey locks are deleted.

…cuted

Co-authored-by: Abhishek Kumar <[email protected]>

Co-authored-by: Abhishek Kumar <[email protected]>

…dn't have

dkg has the concurrency problem, so make it responsible for the fix as well.

Co-authored-by: Abhishek Kumar <[email protected]>