[TEST] Mute failing test: CategorizationIT testBasicCategorization

See elastic/machine-learning-cpp#279

Original commit: elastic/x-pack-elasticsearch@03f0c307b7

plugin/src/test/java/org/elasticsearch/xpack/ml/integration/CategorizationIT.java

@@ -81,6 +81,7 @@ public class CategorizationIT extends MlNativeAutodetectIntegTestCase {
         client().admin().indices().prepareRefresh("*").get();
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/machine-learning-cpp/issues/279")
     public void testBasicCategorization() throws Exception {
         Job.Builder job = newJobBuilder("categorization", Collections.emptyList());
         registerJob(job);