AddrlistClass.getdomainliteral(): rfc822 requires that the domain
literal be wrapped in square brackets.  This fix replaces the square
brackets that were previously being stripped off.  Closes SF bug
#110621.
diff --git a/Lib/rfc822.py b/Lib/rfc822.py
index 42aac1c..2004524 100644
--- a/Lib/rfc822.py
+++ b/Lib/rfc822.py
@@ -703,7 +703,7 @@
     
     def getdomainliteral(self):
         """Parse an RFC-822 domain-literal."""
-        return self.getdelimited('[', ']\r', 0)
+        return '[%s]' % self.getdelimited('[', ']\r', 0)
     
     def getatom(self):
         """Parse an RFC-822 atom."""