Some TestCases are hard bound to 127.0.0.1 IP address. I think, it is useless - especially testing in IPv6 environment is impossible in this case for a such TestCase(-s).
These classes aren't in integration testsuite part, it is in other places.
Some of them are (maybe I've overlooked some others):
Otherwise these tests are run before IP address transformation (usually used node0 variable and tranforms AS7 config file standalone-*.xml), so maybe there isn't present now any mechanism how to get/propagate proper (and wanted) IP address.
Also note - some of them are hardcoded to IP name alias localhost - see JBPAPP-8132 for localhost vs. localhost6.