Upgrade priority: Medium (timely upgrade recommended) - due to change(s): Update to latest sysinfo prevents leaking fd-handlers (paritytech/substrate#6708) Graceful shutdown for the task manager (paritytech/substrate#6654) Update libp2p to 0.22. (paritytech/substrate#6690)

Specs of the runtime can be found here: https://github.com/paritytech/polkadot/releases/tag/v0.8.19 

 Schedule the currently externally-proposed majority-carries referendum to be tabled
 immediately. If there is no externally-proposed referendum currently, or if there is one
 but it is not a majority-carries referendum then it fails.

 The dispatch of this call must be `FastTrackOrigin`.

 - `proposal_hash`: The hash of the current external proposal.
 - `voting_period`: The period that is allowed for voting on this proposal. Increased to
   `FastTrackVotingPeriod` if too low.
 - `delay`: The number of block after voting has ended in approval and this should be
   enacted. This doesn't have a minimum amount.

 Emits `Started`.

 # <weight>
 - Complexity: `O(1)`
 - Db reads: `NextExternal`, `ReferendumCount`
 - Db writes: `NextExternal`, `ReferendumCount`, `ReferendumInfoOf`
 - Base Weight: 30.1 µs
 # </weight>

:
1. Upgrade priority: Medium (timely upgrade recommended) 
2. Change(s): Update to latest sysinfo prevents leaking fd-handlers (paritytech/substrate#6708), Graceful shutdown for the task manager (paritytech/substrate#6654), Update libp2p to 0.22 (paritytech/substrate#6690). 
3. Specification of the runtime is available in specific link.

#49 SetCode, Kusama runtime 2019