Need to remove configuration-and-switch-control grouping

[PrathibaJee]

For the Proposal in the issue https://github.com/openBackhaul/core/issues/20 , need to prune the CoreModel to remove the ConfigurationAndSwitchControl (included in the ReleaseCandidate#1 of the core-model).

Solution : In the UML2YANG tool in the experimental branch , require to modify the field "Prune" to true for the ConfigurationAndSwitchControl class /models/tools/pruning-and-refactoring/core-model/src/main/resources/xslt/pruning-control.xml.

<class id="_k1gHQJo5EeOyHKqw-cQ_eg" name="ConfigurationAndSwitchControl" prune="true"/>