python: remove star imports

Star imports are discouraged and break pyflakes.

I'm happy to report that pyflakes finds no issues ;)

tools/make-directive-index.py

@@ -21,7 +21,7 @@
 import sys
 import collections
 import re
-from xml_helper import *
+from xml_helper import xml_parse, xml_print, tree
 from copy import deepcopy
 
 TEMPLATE = '''\

tools/make-man-index.py

@@ -22,7 +22,7 @@
 import collections
 import sys
 import re
-from xml_helper import *
+from xml_helper import xml_parse, xml_print, tree
 
 MDASH = ' — ' if sys.version_info.major >= 3 else ' -- '
 

tools/make-man-rules.py

@@ -23,7 +23,7 @@ import collections
 import sys
 import os.path
 import pprint
-from xml_helper import *
+from xml_helper import xml_parse
 
 def man(page, number):
     return '{}.{}'.format(page, number)