private SecretStoreMock defaultSecretStore() {
            SecretStoreMock secretStore = new SecretStoreMock();
            KeyPair keyPair = KeyUtils.generateX25519KeyPair();
            secretStore.add(new Secret(Key.fromString("snapshot/sealingPrivateKey"),
                                       KeyUtils.toPem(keyPair.getPrivate(), KeyFormat.PKCS8).getBytes(),
                                       SecretVersionId.of("1")));
            return secretStore;
        }
Returns the hosts from the input list which are not retired
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/ProvisioningTester.java