examples: Add/fix PEP 484 type annotation

Signed-off-by: Philipp Hahn <hahn@univention.de>

examples/dominfo.py

@@ -6,19 +6,20 @@ import sys
 import os
 import libxml2
 import pdb
+from typing import Any
 
-def usage():
+def usage() -> None:
    print('Usage: %s DOMAIN' % sys.argv[0])
    print('       Print information about the domain DOMAIN')
 
-def print_section(title):
+def print_section(title: str) -> None:
     print("\n%s" % title)
     print("=" * 60)
 
-def print_entry(key, value):
+def print_entry(key: str, value: Any) -> None:
     print("%-10s %-10s" % (key, value))
 
-def print_xml(key, ctx, path):
+def print_xml(key: str, ctx, path: str) -> str:
     res = ctx.xpathEval(path)
     if res is None or len(res) == 0:
         value="Unknown"