Bump Alerta image with Docker Secrets and API token fix.

Related-PROD: PROD-34268 PROD-35572
Change-Id: I779257f50f8f27ac74cefd424846aad4aebf632a
diff --git a/defaults/docker_images.yml b/defaults/docker_images.yml
index 14f48ab..a52e160 100644
--- a/defaults/docker_images.yml
+++ b/defaults/docker_images.yml
@@ -27,8 +27,8 @@
     # OpenContrail
     opencontrail_docker_image_tag: "2019.2.10"
     # stacklight
-    # 6.5.0 version, from 11/29/2018, differ from latest upstream 6.5.0 - update next cycle
-    docker_image_alerta: "${_param:mcp_docker_registry}/mirantis/external/alerta-web:2019.2.6"
+    # locally forked v7.4.4, updated 2020-08-06
+    docker_image_alerta: "${_param:mcp_docker_registry}/openstack-docker/alerta:2019.2.11"
     docker_image_alertmanager: "${_param:mcp_docker_registry}/openstack-docker/alertmanager:2019.2.4"
     docker_image_grafana: "${_param:mcp_docker_registry}/openstack-docker/grafana:2019.2.10"
     docker_image_prometheus_es_exporter: "${_param:mcp_docker_registry}/openstack-docker/prometheus-es-exporter:2019.2.6"
@@ -119,9 +119,9 @@
         - registry: ${_param:mcp_docker_registry}/openstack-docker
           target_registry: ${_param:default_local_mirrror_content:docker_client_registry_target_registry}/openstack-docker
           name: alertmanager:2019.2.4
-        - registry: ${_param:mcp_docker_registry}/mirantis/external
-          target_registry: ${_param:default_local_mirrror_content:docker_client_registry_target_registry}/mirantis/external
-          name: alerta-web:2019.2.6
+        - registry: ${_param:mcp_docker_registry}/openstack-docker
+          target_registry: ${_param:default_local_mirrror_content:docker_client_registry_target_registry}/openstack-docker
+          name: alerta:2019.2.11
         - registry: ${_param:mcp_docker_registry}/openstack-docker
           target_registry: ${_param:default_local_mirrror_content:docker_client_registry_target_registry}/openstack-docker
           name: pushgateway:2019.2.6