util_inetaddress-test failure when running in a docker container

[mbautin]

Reported by @lumedar.
Log: https://raw.githubusercontent.com/lumedar/YugaByteLog/master/InetAddressTest_TestErrors.log
Forum post with additional analysis: https://forum.yugabyte.com/t/why-does-the-unit-test-fail-to-pass/130/10

There are at least two issues here:

• Constructing an InetAddress from an invalid host can time out (the test takes 600 seconds).
• We might be handling boost error messages incorrectly, because we're trying to allocate a huge string.

Thanks @lumedar for reporting this!

[jasonyb]

This was inadvertently closed when subtree-merging pgtap in 89e434e because of a pgtap commit message.