Comment 2 for bug 1454697

There were two causes of the leaked file descriptors. One in go.net, and one in the jujud machine agent code. Bug #1420057 tracked the changes to go.net. I'll use this bug for the changes to jujud's machine agent.

The good news is that this problem is far less likely to occur on 1.22 and later as 1.20 (where the problem was originally seen) had a significantly larger timing window for this leak to occur, and the changes made to the agent code in 1.22 made this problem much less likely to be seen.