MNT-16381 Transformers must validate the content stream mimetype

- Tika has problems identifying eps - it guesses ps, so allow this through.
   - Fix lost line in DifferrentMimeTypeTest

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@128176 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/test-java/org/alfresco/repo/content/transform/DifferrentMimeTypeTest.java

@@ -181,6 +181,7 @@ public class DifferrentMimeTypeTest extends TestCase
         }
 
         // Try to transform file with accurate MIME type
+        contentReader = contentReader.getReader();
         contentReader.setMimetype(actualSourceMimetype);
         actualTransformer.transform(contentReader, outputWriter, options);
     }