[devtools] Use XMLValidator instead deprecated SaxOnlyValidator
The renaming was introduced in 198fdadafed6.o
This prevent a meta class conflict introduced by logilab-common 0fcd2e050621.
--- a/devtools/htmlparser.py Fri Apr 26 18:47:36 2013 +0200
+++ b/devtools/htmlparser.py Mon Apr 29 11:06:28 2013 +0200
@@ -90,8 +90,7 @@
'[3.17] you should use the '
'XMLValidator class instead')
-
-class XMLDemotingValidator(SaxOnlyValidator):
+class XMLDemotingValidator(XMLValidator):
""" some views produce html instead of xhtml, using demote_to_html
this is typically related to the use of external dependencies