Implemented DELETE method in CollectionsApi for single deletions
Implemented DELETE method in CollectionsApi for single deletions

Internally using the `delete_` as the function name because of the reserved word.

ManageIQ/manageiq-ui-self_service,dtaylor113/manageiq-ui-self_service,ManageIQ/manageiq-ui-service,AllenBW/manageiq-ui-service,AllenBW/manageiq-ui-service,dtaylor113/manageiq-ui-self_service,ManageIQ/manageiq-ui-service,ManageIQ/manageiq-ui-service,AllenBW/manageiq-ui-service,ManageIQ/manageiq-ui-self_service,dtaylor113/manageiq-ui-self_service,AllenBW/manageiq-ui-service,ManageIQ/manageiq-ui-self_service