Refactored MV-related refactorings to put them under a common parent
package.
Added initial code for add/drop MV log.
Fixed paths to changelog files for existing MV tests.
Adding tests for the create MV Log refactoring.
Adding tests for the create MV Log refactoring.
Added tests for drop MV log.
Fixed paths to XSD file.
Added no-op rollback to MV refresh.