New structure of mirror.mirantis.com

Change-Id: I6985f6d55da8f0722b748a8bdb856c32ecc63ce5
diff --git a/linux/system/repo/mcp/apt_mirantis/grafana.yml b/linux/system/repo/mcp/apt_mirantis/grafana.yml
index 7afe4a1..5bf9396 100644
--- a/linux/system/repo/mcp/apt_mirantis/grafana.yml
+++ b/linux/system/repo/mcp/apt_mirantis/grafana.yml
@@ -6,7 +6,7 @@
     system:
       repo:
         mcp_grafana:
-          source: "deb [arch=amd64] http://mirror.mirantis.com/${_param:linux_system_repo_mcp_grafana_version}/grafana/ jessie main"
+          source: "deb [arch=amd64] http://mirror.mirantis.com/${_param:linux_system_repo_mcp_grafana_version}/grafana/${_param:linux_system_codename}/ jessie main"
           architectures: amd64
           key_id: C2E73424D59097AB
           key_server: keyserver.ubuntu.com