Force LCG to 84 on AFS

Fixes LBCORE-1134

LbConfiguration/python/LbConfiguration/LbLogin.py

@@ -969,8 +969,12 @@ class LbLoginScript(SourceScript):
                 setupprojargs.append("LCGCMT")
                 if ev["CMTCONFIG"].startswith("win32_vc71") :
                     setupprojargs.append("5[0-8]*")
-                if "slc5" in ev["CMTCONFIG"]:
+                elif "slc5" in ev["CMTCONFIG"]:
                     setupprojargs.append("6[0-6]*")
+                elif 'SITEROOT' in ev and ev['SITEROOT'] == '/afs/cern.ch':
+                    # Forcing to LCG 84 on AFS as LCG_85swan1 seems to have issues
+                    # using the SITEROOT to differentiate
+                    setupprojargs.append("84")
                 setupprojargs.append("Python")
                 if opts.pythonvers :
                     setupprojargs.append("-v")