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.

Lib/rfc822.py

@@ -703,7 +703,7 @@ class AddrlistClass:
     
     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."""