Default server endpoint is incompatible with IPv6

[vcrfxia]

The server properties file currently has a default of listeners=http://0.0.0.0:8088 which is incompatible with IPv6. We should update this default to also include http://[::1]:8088, or perhaps http://:::8088 (to avoid issues with localhost described in #2631), or at least add a docs note to warn users about the incompatibility.

[agavra]

Re-opening because of #3314

[big-andy-coates]

As per the comments on #3314, this is not something we can fix in a generic way. Notes/help have been added to the ksql-server.properties file we ship. There's not much else we can do. So... closing...