Add to PhotonValidator and postprocessig the single leg conversions
Database format resolved centrally in connection pool
Unit test fixed for new exception policy
Merge pull request #2355 from nancymarinelli/egmGedValidationUpdatesFor71X_2

Validation -- Add to PhotonValidator and postprocessing the single leg conversions.
Merge pull request #2472 from ggovi/new-conddb-perf-0

DB -- Database format resolved centrally in connection pool
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X