Add proper LCG_97a_LHCB_2 meta RPMs

Marco Clemencicrequested to merge
fix-97a_LHCB_2-meta-rpms into master

to get a correct installation of the LHCb layers for the generators, we have to install the regular packages as well as the generators.

Closes #3 (closed)

Edited by Marco Clemencic

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