Read in the ``file_client`` option and return the correct type of file
    server

def get_file_client(opts, pillar=False):
    '''
    Read in the ``file_client`` option and return the correct type of file
    server
    '''
    client = opts.get('file_client', 'remote')
    if pillar and client == 'local':
        client = 'pillar'
    return {
        'remote': RemoteClient,
        'local': FSClient,
        'pillar': PillarClient,
    }.get(client, RemoteClient)(opts)