#236 Prepare to Java 12's changed UUID validation

[Viczian Istvan]

In Java 12 the UUID class's fromString method throws
IllegalArgumentException instead of NumberFormatException when
the UUID is too long.

Patch: https://github.com/vicziani/dbunit/commit/c5c53f14b71b3b157627cbb60ae8747d657dfc44.patch

[Jeff Jensen]

Thank you!