Move runtime upgrade to frame-executive (#5197)

* Move runtime upgrade to `frame-executive`

Instead of storing the runtime upgraded in the space of `frame-system`,
this moves it to `frame-executive`. We also start storing the
`spec_version` and `impl_version` the last runtime upgrade was applied.

This scheme has multiple advantages:
- We don't need to make sure that runtime upgrade was set.
- This will work in the future when we want to test a runtime upgrade,
because the `on_runtime_upgrade` will be executed automatically when the
runtime changes.

* Move `LAST_RUNTIME_UPGRADE` key to `frame-executive`

* Add some more documentation

* Make sure `spec_version` always increases between runtime upgrades

* Fix test

* Upgrade `parity-multiaddr` to fix compilation

* Also check if the `spec_name` changed

* Remove `RuntimeUpgraded` storage entry

* Don't run on genesis

substrate/primitives/storage/src/lib.rs

@@ -207,7 +207,7 @@ impl<'a> ChildInfo<'a> {
 		}
 	}
 
-	/// Create child info from a linear byte packed value and a given type. 
+	/// Create child info from a linear byte packed value and a given type.
 	pub fn resolve_child_info(child_type: u32, data: &'a[u8]) -> Option<Self> {
 		match child_type {
 			x if x == ChildType::CryptoUniqueId as u32 => Some(ChildInfo::new_default(data)),