Companion for substrate#9080 (#3263)

* runtime(kusama/polkadot): migrations for membership storage prefix

Signed-off-by: koushiro <[email protected]>

* Fix

Signed-off-by: koushiro <[email protected]>

* make correct custom migration

* some fix

* Update

Signed-off-by: koushiro <[email protected]>

* Fix format

Signed-off-by: koushiro <[email protected]>

* import traits

* update Substrate

Co-authored-by: thiolliere <[email protected]>
Co-authored-by: parity-processbot <>