JENKINS-20974 - RunParameter with filtering enabled should not include builds which are not yet completed

Hi

I had previously added RunList.overThresholdOnly method in Jenkins 1.517
This is not filtering out builds which are still being built.

Not sure if I just change the otherThresholdOnly method or if I should create a new  otherThresholdAndCompletedOnly method which also checks if the build is not building.

Dont know if anyone else is using the existing method so reluctant to change it.
This pull request creates a new method.

thanks
Geoff