Looks for all the files in the S3 bucket cache metadata

def _find_files(metadata):
    '''
    Looks for all the files in the S3 bucket cache metadata
    '''

    ret = {}

    for bucket, data in six.iteritems(metadata):
        if bucket not in ret:
            ret[bucket] = []

        # grab the paths from the metadata
        filePaths = [k['Key'] for k in data]
        # filter out the dirs
        ret[bucket] += [k for k in filePaths if not k.endswith('/')]

    return ret