Don't use G4* environment varaibles in the hadronic tests (See LHCBGAUSS-739)

See LHCBGAUSS-739. We can use a slot name for the plot names in lhcbpr instead of putting Geant version into the plots

Geant4/G4examples/extended/hadronic/G4Hadr00/scripts/run_hadronic_tests.py

@@ -132,8 +132,6 @@ for phys_list in phys_lists :
 
 ############# Plotting graphs on pdf
 
-G4version = os.environ["G4VERS"]
-
 c1 = TCanvas()
 
 part  = ['pi-', 'kaon-', 'proton']
@@ -149,7 +147,7 @@ for p,ap in zip(part,apart) :
     _file3 = TFile("root/QGSP_BERT_"+ap+"_Al.root");
     gr3 = _file3.Get("Total");
 
-    gr0.SetTitle("Comparison of physics lists in Geant4 " + G4version);
+    gr0.SetTitle("Comparison of physics lists in Geant4 ");
     gr0.GetXaxis().SetTitle("Energy (MeV)");
     gr0.GetYaxis().SetTitle("Total cross section (b)");
     gr0.SetLineWidth(2)