Fix Ignored Tests So That They Will Be Run

These tests are intentionally not being run by the build and need to be fixed:

1. org.teiid.designer.core.test/TestModelEditor: has renamed tests so that those tests will not be run
2. org.teiid.designer.dqp.test/ServerTest: this test class has been commented out in pom.xml
3. org.teiid.designer.query.ui.test/TestDisplayNodeFactory: has renamed tests so that those tests will not be run
4. org.teiid.designer.transformation.test/TestPerformanceIndexFilePerRecordType: (a) has renamed tests so that those tests won't run, and (b) its helpCreateIndexFile() method is swallowing failed assertions and shouldn't
5. a search of // TODO comments should be done to find other ignored tests

For tests in projects that use PowerMock, TEIIDDES-802 will need to be fixed first.