apply 2to3 conversions (this file is not packaged here, but easier to add
this while still using a version of Python that includes 2to3)

Index: bin/flow-log2rrd
--- bin/flow-log2rrd.orig
+++ bin/flow-log2rrd
@@ -40,8 +40,8 @@ while line :
   elif fields[4][5:12] == 'capture' :
     name='capture'
   else :
-    raise ValueError, "Expecting flow-capture or flow-fanout logs, got %s" %\
-      fields[4]
+    raise ValueError("Expecting flow-capture or flow-fanout logs, got %s" %\
+      fields[4])
 
   tv = {}
   for f in fields :
@@ -65,7 +65,7 @@ while line :
 
     if not os.access(rrdFile, os.F_OK) :
 
-      print 'Creating RRD ', rrdFile
+      print('Creating RRD ', rrdFile)
 
       if name == 'capture' :
 
