[eclipselink-dev] Fix for bug 306075

[David Minsky <david.minsky@xxxxxxxxxx>]

"=null" is generated instead of "is null" for direct collection
https://bugs.eclipse.org/bugs/show_bug.cgi?id=306075

Fix to DirectCollectionMapping to add a cached "delete null" query to be 
used for correct SQL generation in direct collection null element 
removal/deletion

Contributed: John Vandale
Reviewed: Chris Delahunt, David Minsky
Testing: LRG & JPA FullRegressionTestSuite
New tests: DirectCollectionMappingDeleteNullValueTest (added to 
MappingTestModel)

IP Log updated - 
http://wiki.eclipse.org/EclipseLink/IPLog#Contributions_-_2.1_Release_Log

Fixed in revision 6994

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