fix api key revocation issue.

Author: dushaniw

components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIConsumerImpl.java

@@ -3310,6 +3310,7 @@ public void revokeAPIKey(String apiKey, long expiryTime, String tenantDomain) th
         int tenantId = APIUtil.getTenantIdFromTenantDomain(tenantDomain);
         String eventID = UUID.randomUUID().toString();
         properties.put(APIConstants.NotificationEvent.EVENT_ID, eventID);
+        properties.put(APIConstants.NotificationEvent.EVENT_TYPE, APIConstants.API_KEY_AUTH_TYPE);
         properties.put(APIConstants.NotificationEvent.TOKEN_TYPE, APIConstants.API_KEY_AUTH_TYPE);
         properties.put(APIConstants.NotificationEvent.TENANT_ID, tenantId);
         properties.put(APIConstants.NotificationEvent.TENANT_DOMAIN, tenantDomain);