User request from Yu Huang

> Do you guys know how to fix the clustering size for executable "cleanup"? I basically want the cleanup job to be always clustered regardless of the parent job's clustering profile.
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> I want to set it to something like 50 or 100. Because cleanup jobs takes very little time, in the current setting, it depends on the parent job. Some parent job has low clustering profile because each takes a long time to run but cleanup is always like a second. And then turnover is so frequent, it slows down the condor workflow (lots of jobs in POST).
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