new condition object (ZDC Low Gain Fraction) added for HCAL

new condition object named ZDC Low Gain Fraction was added for HCAL
Hi Audrius,

[...]
> > +{
> > +  //  edm::LogInfo   ("HcalZDCLowGainFractionsHandler")
> > +  std::cout
>
> Cout is used In all of the HCAL condition object handlers so maybe we need
> to do a fix for all of them?
>
>
while this is true - you can already start here with this one. And if you
have time, make another PR (or several) for the others ... ;)

Thanks,
       cheers, andreas