Turn off pre-release on V8_1_6-branch
Turn off pre-release on V8_1_6-branch

htcondor/htcondor,zhangzhehust/htcondor,zhangzhehust/htcondor,zhangzhehust/htcondor,htcondor/htcondor,neurodebian/htcondor,zhangzhehust/htcondor,htcondor/htcondor,djw8605/htcondor,djw8605/htcondor,zhangzhehust/htcondor,djw8605/htcondor,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,djw8605/htcondor,zhangzhehust/htcondor,htcondor/htcondor,djw8605/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,djw8605/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,neurodebian/htcondor,djw8605/htcondor,htcondor/htcondor,djw8605/htcondor,htcondor/htcondor,htcondor/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,djw8605/htcondor