Make rounding for the provisioner go away from 0 on ties in Python 3
Make rounding for the provisioner go away from 0 on ties in Python 3

This is necessary to pass src/toil/test/provisioners/clusterScalerTest.py::ClusterScalerTest::testPreemptableDeficitResponse

BD2KGenomics/slugflow,BD2KGenomics/slugflow