Set telegraf version 2019.2.6

Change-Id: If95b998dd691a966edafb573049554ff2d7055a5
Related-PROD: PROD-32734
diff --git a/defaults/docker_images.yml b/defaults/docker_images.yml
index f3534ed..ac2d649 100644
--- a/defaults/docker_images.yml
+++ b/defaults/docker_images.yml
@@ -37,7 +37,7 @@
     docker_image_prometheus_gainsight_elasticsearch: "${_param:mcp_docker_registry}/openstack-docker/gainsight_elasticsearch:${_param:mcp_version}"
     docker_image_prometheus_relay: "${_param:mcp_docker_registry}/openstack-docker/prometheus-relay:2019.2.5"
     docker_image_pushgateway: "${_param:mcp_docker_registry}/openstack-docker/pushgateway:${_param:mcp_version}"
-    docker_image_remote_agent: "${_param:mcp_docker_registry}/openstack-docker/telegraf:2019.2.5"
+    docker_image_remote_agent: "${_param:mcp_docker_registry}/openstack-docker/telegraf:2019.2.6"
     docker_image_remote_collector: "${_param:mcp_docker_registry}/openstack-docker/heka:${_param:mcp_version}"
     docker_image_remote_storage_adapter: "${_param:mcp_docker_registry}/openstack-docker/remote_storage_adapter:${_param:mcp_version}"
     docker_image_sf_notifier: "${_param:mcp_docker_registry}/openstack-docker/sf_notifier:2019.2.4"
@@ -124,7 +124,7 @@
           name: gainsight:2019.2.4
         - registry: ${_param:mcp_docker_registry}/openstack-docker
           target_registry: ${_param:default_local_mirrror_content:docker_client_registry_target_registry}/openstack-docker
-          name: telegraf:2019.2.5
+          name: telegraf:2019.2.6
         - registry: ${_param:mcp_docker_registry}/openstack-docker
           target_registry: ${_param:default_local_mirrror_content:docker_client_registry_target_registry}/openstack-docker
           name: remote_storage_adapter:${_param:mcp_version}