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Merge pull request #2 from riptano/2461-peername-ipv6

Account for IPV6 in hostname stuff

Avoid deadlock in running closers. Fixes #2457

This is a further elaboration of the work done in #2280, and should be
completely compatible (and has been tested) with the recent change in
r7889:cddadb6808c0.

Jim's theory (and Jim is the committer of this change on Nick's
behalf): synchronizing on the class, vs an object, is a bad idea
because of class unloading that's happening at shutdown. At the very
least this is now tied to the closer itself.

Prepare for release.

Prepare for release.

Remove + from version.