Try to reconcile (except for whitespace) eventdns with version in libevent, so it is easier for me to send merges. These changes should be cosmetic. (Ha!)
svn:r9117
Implement reverse DNS lookup in eventdns: add new entry point; rename old entry point; revise TODO a little; add facility for parsing dns names.
svn:r7070
possible. Cache at the server side independently from the TTL, to
prevent attackers from probing the server to see who has been asking
for what hostnames. (Hi, Dan Kaminski!)
Also, clean some whitespace.
svn:r6526
