New PostLS3 GT containing RPC conditions for digitization.

Signed-off-by: Salvatore Di Guida <salvatore.di.guida@cern.ch>
Merged autoCondForPostLS3 from repository diguida
fixed bug in RPCSimSetup --- it crashed when reading in conditions from detids not in the loaded RPC geometry
changed //std::cout to LogDebug
Merge pull request #2562 from pietverwilligen/RPSSimSetupFix

Fix to RPCSimSetup