Refactoring harness integeration test files

[Amemeda]

• Removing "# TODO: these test classes should be moved into the correct package for the module" from line 42 of check-module-packaging-conventions.sh
• created new folder src/main/java/org/apache/accumulo/test/harness
• deleted old folder src/main/java/org/apache/accumulo/harness/conf
• refactored all 12 integration test files into new test/harness folder
• Fixed many many import errors resulting from refactoring

[Amemeda]

This pr resolves 1 TODO from #2699