fix centos 7 remove centos 8

Gabriele Contini

2019-12-14 3d0e4a9b2134d05d1a652e10273187690fe634ff

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[submodule "license-generator"]
    path = extern/license-generator
    url = https://github.com/open-license-manager/lcc-license-generator.git
    branch = develop