Add methods for performing specific types of requests to
NetLicensingService class
Add implementation and tests for method "create" of LicenseeService
Add implementation and tests for method "validate" of LicenseeService
Add implementation and tests for method "get" of LicenseeService
Add implementation and tests for method "list" of LicenseeService
Add implementation and tests for method "update" of LicenseeService
Add implementation and tests for method "delete" of LicenseeService