More memory leak fixes
----------------------
Key: TUSCANY-4034
URL: https://issues.apache.org/jira/browse/TUSCANY-4034
Project: Tuscany
Issue Type: Bug
Affects Versions: Java-SCA-2.0-Beta3
Environment: All
Reporter: Simon Laws
Fix For: Java-SCA-2.0
Plugging variuous potential memory leaks.
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