Preserve Python 2.4 compatibility.
Preserve Python 2.4 compatibility.

A new style of string formatting was introduced in Python 2.6.
Preserve Python 2.4 compatibility by switching back to the old style.

preo/dnspython,cluck/dnspython,rcorrieri/dnspython,leeclemens/dnspython,tomlanyon/dnspython,tow/dnspython,Abhayakara/dnspython,fjxhkj/dnspython