ensure license is available before running license api bwc tests (elastic#131422)

Author: richard-dennehy

x-pack/qa/xpack-prefix-rest-compat/src/yamlRestTestV7Compat/java/org/elasticsearch/xpack/test/rest/XPackRestIT.java

@@ -10,6 +10,7 @@
 import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
 
 import org.elasticsearch.test.rest.yaml.ClientYamlTestCandidate;
+import org.junit.Before;
 
 public class XPackRestIT extends AbstractXPackRestTest {
 
@@ -21,4 +22,12 @@ public XPackRestIT(ClientYamlTestCandidate testCandidate) {
     public static Iterable<Object[]> parameters() throws Exception {
         return createParameters();
     }
+
+    /**
+     * Some rest tests depend on the trial license being generated before they run
+     */
+    @Before
+    public void setupLicense() {
+        super.waitForLicense();
+    }
 }