Ability to remove only tokens on logout

@click.command('logout', help="Logout")

@click.option('-r', '--remote', required=False, help='Sets remote for the login')

@click.option('-a', '--all', required=False, help='Remove all login info', 

              is_flag=True, default=False)

@click.pass_obj

def cli_logout(obj: AppConfig, remote):

def cli_logout(obj: AppConfig, remote: str, all: bool):

    print(f"Logout from: {remote.name} ({remote.url})")

    remote: Remote = helpers.get_remote(obj, remote)

    _logout(remote)

    _logout(remote, all=all)

    helpers.entity_printer(remote)

def _logout(remote: Remote):

def _logout(remote: Remote, all: bool):

    def __safe_del(remote: Remote, name: str):

        if name in remote.config:

            del remote.config[name]

    for name in ['access_token', 'refresh_token', 'secret', 'username', 'password', 'identifier']:

        __safe_del(remote, name)

    def __del_params(*params):

        for name in params:

            __safe_del(remove, name)

    __del_params('access_token', 'refresh_token')

    if all:

        __del_params('username', 'identifier', 'password', 'secret')

    remote.update()