Fix XROOTStorage: putFile puts files in wrong place on EOS

In some cases the Path checked here already starts with //, so this check would
fail and the rootdir would be prepended again.  This results in files ending up
in the wrong place.

Resources/Storage/XROOTStorage.py

@@ -1626,7 +1626,7 @@ def getProtocolPfn( self, pfnDict, withPort ):
     pfnDict['Protocol'] = self.protocol
     pfnDict['Host'] = self.host
 
-    if not pfnDict['Path'].startswith( self.rootdir ):
+    if not (pfnDict['Path'].startswith( self.rootdir ) or pfnDict['Path'].startswith( "/"+self.rootdir )):
       pfnDict['Path'] = os.path.join( self.rootdir, pfnDict['Path'].strip( '/' ) )
 
     # These lines should be checked