Update metadata.yaml to support MOS 9.0

This change adds support for both liberty-9.0 and mitaka-9.0 releases.
Eventually liberty-9.0 can be removed once [1] gets merged.

[1] I92fb23d65fce8253d3da3f7352b8428a5e9a98f2

Change-Id: I1d5f1454cf3bb42d0eb362600afec7dc3d674a01

metadata.yaml

@@ -7,7 +7,7 @@ version: '0.9.0'
 # Description
 description: Deploy InfluxDB server and the Grafana web interface.
 # Required fuel version
-fuel_version: ['8.0']
+fuel_version: ['8.0', '9.0']
 # Specify license of your plugin
 licenses: ['Apache License Version 2.0']
 # Specify author or company name
@@ -26,6 +26,16 @@ releases:
     mode: ['ha']
     deployment_scripts_path: deployment_scripts/
     repository_path: repositories/ubuntu
+  - os: ubuntu
+    version: liberty-9.0
+    mode: ['ha']
+    deployment_scripts_path: deployment_scripts/
+    repository_path: repositories/ubuntu
+  - os: ubuntu
+    version: mitaka-9.0
+    mode: ['ha']
+    deployment_scripts_path: deployment_scripts/
+    repository_path: repositories/ubuntu
 
 # Version of plugin package
 package_version: '4.0.0'