[eclipselink-dev] Fix to bug 226508 checked in

["Peter Krogh" <peter.krogh@xxxxxxxxxx>]

Code Reviewed by: Tom Ware
226508 - 3 tests intermittently fail on the Build server MySQL installation

https://bugs.eclipse.org/bugs/show_bug.cgi?id=226508

This 'fix' implements a workaround to the known MySQL problem that causes three of our tests to intermittently fail on the build machine.  

The solution is to catch the exception in the three tests and inspect the causes looking for the specific exception.

As reproducing the conditions of the failure exactly seems to only be possible during the actual nightly build, I wasn't able to test if this solution will actually work, but I did test that it doesn't break anything.