Adding a final class

"..If a nonfinal class implements a constant interface, all of its subclasses will have their namespaces polluted by the constants in the interface."

url - https://ci.openmrs.org/sonar/drilldown/issues/1865?rids%5B%5D=2245&rule=squid%3AS1214&rule_sev=MINOR&severity=MINOR#

Update TransformOperator.java

Update ComparisonOperator.java

Update ComparisonOperator.java

Update LogicalOperator.java

Update LogicDataSource.java

Update ObsService.java

Update ExportColumn.java

Update ComplexObsHandler.java
Merge branch 'gci-2014' of https://github.com/meghna97/openmrs-core into gci-2014