inclomplete Lustre module data and memory leak

[carns]

The first log in this set provided by @Nafi3 produces an incomplete log data error on the Lustre module when parsed with darshan-parser. This is a little surprising because I would not expect that module to exhaust the memory limit. We should try to understand why this happened.

Secondarily, when darshan-parser encounters this problem, it exits with an error message (as expected) but leaks memory while shutting down. This is unlikely to be a significant problem, but is really distracting when using a memory sanitizer.

darshan-parser runs to completion without error when using the --show-incomplete option.