Simplification of PrescaleService
Merged refs/pull/1651/head from repository cms-sw
Restore forceDefault functionality
Merge pull request #1651 from Martin-Grunewald/PrescaleServiceRedux

Simplification of PrescaleService
Merge pull request #1615 from wmtan/ProtectAgainstMultipleOffsets

Protect against multiple shifting for out of time pileup
Don't store bunchspace as it may be updated