[Review Only] Autoseal OSS port (#757)

* Port awskms autoseal

* Rename files

* WIP autoseal

* Fix protobuf conflict

* Expose some structs to properly allow encrypting stored keys

* Update awskms with the latest changes

* Add KeyGuard implementation to abstract encryption/decryption of keys

* Fully decouple seal.Access implementations from sealwrap structs

* Add extra line to proto files, comment update

* Update seal_access_entry.go

* govendor sync

* Add endpoint info to configureAWSKMSSeal

* Update comment

* Refactor structs

* Update make proto

* Remove remove KeyGuard, move encrypt/decrypt to autoSeal

* Add rest of seals, update VerifyRecoveryKeys, add deps

* Fix some merge conflicts via govendor updates

* Rename SealWrapEntry to EncryptedBlobInfo

* Remove barrier type upgrade check in oss

* Add key to EncryptedBlobInfo proto

* Update barrierTypeUpgradeCheck signature

command/server/config.go

@@ -735,6 +735,7 @@ func parseSeal(result *Config, list *ast.ObjectList, blockName string) error {
 	// Valid parameter for the Seal types
 	switch key {
 	case "pkcs11":
+	case "alicloudkms":
 	case "awskms":
 	case "gcpckms":
 	case "azurekeyvault":