merge V8_6_0 branch and fixup version & prerelease
merge V8_6_0 branch and fixup version & prerelease

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor