Show a single user.

    login
        Login of the user.

    profile
        Configuration profile used to connect to the Grafana instance.
        Default is 'grafana'.

    CLI Example:

    .. code-block:: bash

        salt '*' grafana4.get_user <login>

def get_user(login, profile='grafana'):
    '''
    Show a single user.

    login
        Login of the user.

    profile
        Configuration profile used to connect to the Grafana instance.
        Default is 'grafana'.

    CLI Example:

    .. code-block:: bash

        salt '*' grafana4.get_user <login>
    '''
    data = get_users(profile)
    for user in data:
        if user['login'] == login:
            return user
    return None