Add BEEFY capabilities to Westend and Kusama (#7591)

* runtime: add BEEFY and MMR to Westend

Signed-off-by: Adrian Catangiu <adrian@parity.io>

* runtime: add BEEFY and MMR to Kusama

Signed-off-by: Adrian Catangiu <adrian@parity.io>

* node/service: enable BEEFY for Westend and Kusama

Signed-off-by: Adrian Catangiu <adrian@parity.io>

* node/service: regenerate genesis keys for westend-native and kusama-native

Since these keys are only used for development/local chains, also publish
the secret seeds used to generate the public keys, so that developers can
recover/generate the private key pairs if needed.

Signed-off-by: Adrian Catangiu <adrian@parity.io>

* runtime: add session keys migration to add BEEFY to Westend and Kusama

* runtime: fix migration

* fix try-runtime build

* cargo fmt

* fix parachains slashing benchmark

* address review comments

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* runtime: fix session keys migration

---------

Signed-off-by: Adrian Catangiu <adrian@parity.io>
Co-authored-by: parity-processbot <>
Co-authored-by: Bastian Köcher <git@kchr.de>

polkadot/scripts/prepare-test-net.sh

@@ -15,7 +15,7 @@ generate_address() {
 }
 
 generate_public_key() {
-	subkey inspect ${3:-} ${4:-} "$SECRET//$1//$2" | grep "Public" | awk '{ print $4 }'
+	subkey inspect ${3:-} ${4:-} "$SECRET//$1//$2" | grep "Public key (hex)" | awk '{ print $4 }'
 }
 
 generate_address_and_public_key() {