Introduce `OriginPrivilegeCmp` (#4166)

* Introduce `OriginPrivilegeCmp`

Make use of the new `OriginPrivilegeCmp` feature of pallet scheduler.
The idea is to make sure that a council origin with more yes votes has
higher privileges than a council origin with less yes votes. This solves
a problem that happened recently on Kusama where the council tried to
cancel a scheduled task, but that required that the same council origin
was used while the cancel motion had more yes votes than the origin
motion that scheduled this task. With this origin privilege compare it
should now be solved by checking the yes votes directly.

* Feedback

* update lockfile for substrate

Co-authored-by: parity-processbot <>