Inconsistent build failure.

The project build fails inconsistently on Travis and Appveyor.
Tests fail inconsistently due to the following Runtime error.

```
HDF5-DIAG: Error detected in HDF5 (1.8.11) thread 140198367926016:
#000: ../../../src/H5L.c line 813 in H5Lexists(): not a location
major: Invalid arguments to routine
minor: Inappropriate type
#001: ../../../src/H5Gloc.c line 195 in H5G_loc(): invalid group ID
major: Invalid arguments to routine
minor: Bad value
```

Currently, Maven Surefire plugin is configured to ignore Test errors.
Investigate root cause of the issue.

Start by running the Maven test suite with the Surefire configuration that currently ignores test errors, then compare failures on Travis and Appveyor. Trace the HDF5 runtime error and identify its root cause; done means the intermittent failure is explained and tests no longer need to be ignored.

Written by the indexing model from the issue text.