Executes a user search for the given query.

def users(accountable, query):
    """
    Executes a user search for the given query.
    """
    users = accountable.users(query)
    headers = ['display_name', 'key']
    if users:
        rows = [[v for k, v in sorted(u.items()) if k in headers]
                for u in users]
        rows.insert(0, headers)
        print_table(SingleTable(rows))
    else:
        click.secho('No users found for query {}'.format(
            query
        ), fg='red')