In #786, we did skip it in the daily, but not for the others.
When running ./runtest on MacOS, we will get the failure.
```
couldn't open socket: host is unreachable (nodename nor servname provided, or not known)
```
The reason is that TCL 8.5 doesn't support ipv6, so we skip tests
tagged with ipv6. This also revert #786.
Signed-off-by: Binbin <binloveplay1314@qq.com>
76ad8f7a76