Move code to generate RPM out of LbEnv
I moved the code to generate the RPM with LbEnv.sh
(and the new group login script I was preparing) to https://gitlab.cern.ch/lhcb-core/LbEnvBootstrap, basically because I could not stand anymore making a release of LbEnv just to get a new RPM built.
See LBCORE-1671
Edited by Marco Clemencic