Fixed pip upgrade for older linux versions
Fixed pip upgrade for older linux versions

msreis/SigNetSim,vincent-noel/SigNetSim,vincent-noel/SigNetSim,vincent-noel/SigNetSim,msreis/SigNetSim,vincent-noel/SigNetSim,msreis/SigNetSim,msreis/SigNetSim