Checked in: Fix test case issue in JPA test on server

Modify test case to remove an wrapping exceptions such as rollback,
runtime, etc. to get nested exception in Server, here should be
OptimisticLocakException.
These tests passed on both inside and outside Container now.

Reviewed by Edwin Tang

Checked in both 2.0 and 1.1 branch, Revision (2.0): 4636

https://bugs.eclipse.org/bugs/show_bug.cgi?id=264582
https://bugs.eclipse.org/bugs/show_bug.cgi?id=264589

- Kevin
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