feat: enable the metadata grains server by default

salt/files/cloud.providers.d/_ec2.conf

@@ -7,6 +7,7 @@ ec2_ubuntu_public:
     master: {{ cloud.get('master', 'salt') }}
   grains:
     test: True
+    metadata_server_grains: True
   ssh_interface: public_ips
   id: {{ cloud.get('aws_key', 'DEFAULT') }}
   key: '{{ cloud.get('aws_secret', 'DEFAULT') }}'