Merge pull request rthalley#191 from pspacek/master

Add method to force re-read resolv.conf: resolver.reset_default_resolver()

dns/resolver.py

@@ -1088,12 +1088,20 @@ def set_flags(self, flags):
 
 def get_default_resolver():
     """Get the default resolver, initializing it if necessary."""
-    global default_resolver
     if default_resolver is None:
-        default_resolver = Resolver()
+        reset_default_resolver()
     return default_resolver
 
 
+def reset_default_resolver():
+    """Re-initialize default resolver.
+
+    resolv.conf will be re-read immediatelly.
+    """
+    global default_resolver
+    default_resolver = Resolver()
+
+
 def query(qname, rdtype=dns.rdatatype.A, rdclass=dns.rdataclass.IN,
           tcp=False, source=None, raise_on_no_answer=True,
           source_port=0):