Revert "Check for duplicate lumisections before proceeding to write lumiSummary.json." and "Keep track of job info in lumiDict and print more detailed warning when there are duplicate lumis."

This reverts commits 1c33e6092fd03a8f56bdeff0449f495af9e63191 and d23a9a4c8d9b347f9b368422401f96fced26e5e2.
CRAB_2_10_5_patch1_jmt4.