Revert IPv6 listening support

There were too many problems found so drop this functionality on
the stable branch. It will be revisited for the next release.

This reverts commit 4561f7e9c63c6ca2859da9b9fa75f64a1a8c2a81.
This reverts commit 6abf3f4c87a0309d5e7d436e4b72d26a08631ebf.
This reverts commit 820c0ceb2ed92080e8d76d50b78ba01bd264baef.
This reverts commit 698371a65002c8785c34481635044fddc217d3f1.
This reverts commit 6ae42df65141ccb49c875bda45b8f5ae9fa60c28.
This reverts commit f1665ac7fbff068ffc2c2f3f110645609b73806c.
This reverts commit 14263e17e425d1bca7e99d4ddfca1ace3bae0ca7.
This reverts commit 07cd2298dcbf7da8db22d630cb84c0216da30ea1.
This reverts commit 8e101704c32c47654d7453f5bde42d8d0c8cc160.