Use the NetBSD inet_ntop until the OpenBSD bug is fixed.

Stupidly I found this bug by accident when writing the existing
tests, but I didn't think any real code would hit it. It turns
out that libcore always uses an INET6_ADDRSTRLEN-sized buffer
even when working with AF_INET addresses.

Change-Id: Ieffc8e4bbe9b66b49b033e3e7101c896e097e6f8
3 files changed