Retrieve HLA calls and input fastqs for a sample.

def get_hla(sample, cromwell_dir, hla_glob):
    """Retrieve HLA calls and input fastqs for a sample.
    """
    hla_dir = glob.glob(os.path.join(cromwell_dir, hla_glob, "align", sample, "hla"))[0]
    fastq = os.path.join(hla_dir, "OptiType-HLA-A_B_C-input.fq")
    calls = os.path.join(hla_dir, "%s-optitype.csv" % sample)
    return fastq, calls