private List<PermissionArgs> extractPermissionArgs(final Namespace namespace, final String dest) {
        return extractArgs(namespace, dest, list -> new PermissionArgs(list.getFirst(), list.get(1)));
    }
Creates an account in the internal identity provider
<p>
e.g manage_users ../local.yml
--createUser admin
--createGroup Administrators
--addToGroup admin Administrators
--grantPermission Administrators Administrator
stroom-app/src/main/java/stroom/app/commands/ManageUsersCommand.java