If checked, the pooling is skipped (returning no chnages found) if jobs currently runs

• By default it is not selected
• It do not have much sense to have enabled both "require worksapce" and this
• it of course kill the can run in parallel feature
• General usecase is:
• do not enable run in parallel with this feature
• all the troubels are with archiving of build.xml, it match with build nvr and usage of archved build.xml to rerun the nvr
• with worksapce on, soemtimes the poling got stuck, waiting for wrkscpae for hours
• this is avoiding this problem, but may have other consequences
• this option is not exactly best tested, as is new