Improve qhostinfo autotest on HPUX 11i

Improve qhostinfo autotest on HPUX 11i

Several test functions use IPv6 reverse lookups, which evidently don't
work on HPUX 11i, but only one of these tests was skipped on that
platform and the others presumably fail.

This commit also removes the commented-out test data and makes it easier
to put some useful test data back. QTBUG-22287 records the fact that no
real IPv6 hostnames are currently used in the reverseLookup test.

Change-Id: Iff1ed1b725492bcc28ca4cb5f8e2dc106887c0b4
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>