Passing os-username, os-password and –os-tenant-id to nova for custom script without env variables

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Yeah , kind of what it says on the tin, but needed this for some automation testing

nova --os-username $USERNAME --os-auth-system=rackspace  --os-tenant-name $DDI --os-auth-url https://lon.identity.api.rackspacecloud.com/v2.0/ --os-password $API  list