remove register and remove license from license manager service

Original commit: elastic/x-pack-elasticsearch@8e593a126c

marvel/src/test/java/org/elasticsearch/marvel/agent/collector/AbstractCollectorTestCase.java

@@ -235,14 +235,6 @@ public class AbstractCollectorTestCase extends MarvelIntegTestCase {
 
         private volatile License license;
 
-        @Override
-        public void registerLicense(PutLicenseRequest request, ActionListener<LicensesService.LicensesUpdateResponse> listener) {
-        }
-
-        @Override
-        public void removeLicense(DeleteLicenseRequest request, ActionListener<ClusterStateUpdateResponse> listener) {
-        }
-
         @Override
         public List<String> licenseesWithState(LicenseState state) {
             return null;