Disable TestZenDiscovery in cloud providers integrations test

TestZenDiscovery is used to allow discovery based on in memory structures. This isn't a relevant for the cloud providers tests (but isn't a problem at the moment either)

plugins/discovery-azure-classic/src/test/java/org/elasticsearch/cloud/azure/classic/AbstractAzureComputeServiceTestCase.java

@@ -38,6 +38,11 @@ public abstract class AbstractAzureComputeServiceTestCase extends ESIntegTestCas
         this.mockPlugin = mockPlugin;
     }
 
+    @Override
+    protected boolean addTestZenDiscovery() {
+        return false;
+    }
+
     @Override
     protected Settings nodeSettings(int nodeOrdinal) {
         Settings.Builder builder = Settings.builder()

plugins/discovery-azure-classic/src/test/java/org/elasticsearch/discovery/azure/classic/AzureMinimumMasterNodesTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.discovery.azure.classic;
 
-import org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.cloud.azure.classic.AbstractAzureComputeServiceTestCase;
 import org.elasticsearch.cloud.azure.classic.AzureComputeServiceTwoNodesMock;
 import org.elasticsearch.common.settings.Settings;
@@ -59,6 +58,7 @@ public class AzureMinimumMasterNodesTests extends AbstractAzureComputeServiceTes
         return builder.build();
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/27917")
     public void testSimpleOnlyMasterNodeElection() throws IOException {
         logger.info("--> start data node / non master node");
         internalCluster().startNode();

plugins/discovery-ec2/src/test/java/org/elasticsearch/discovery/ec2/AbstractAwsTestCase.java

@@ -24,7 +24,6 @@ import org.elasticsearch.common.io.PathUtils;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.settings.SettingsException;
 import org.elasticsearch.env.Environment;
-import org.elasticsearch.discovery.ec2.Ec2DiscoveryPlugin;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.ESIntegTestCase.ThirdParty;
@@ -69,4 +68,9 @@ public abstract class AbstractAwsTestCase extends ESIntegTestCase {
     protected Collection<Class<? extends Plugin>> nodePlugins() {
         return Arrays.asList(Ec2DiscoveryPlugin.class);
     }
+
+    @Override
+    protected boolean addTestZenDiscovery() {
+        return false;
+    }
 }

plugins/discovery-gce/src/test/java/org/elasticsearch/discovery/gce/GceDiscoverTests.java

@@ -104,6 +104,11 @@ public class GceDiscoverTests extends ESIntegTestCase {
             .build();
     }
 
+    @Override
+    protected boolean addTestZenDiscovery() {
+        return false;
+    }
+
     @BeforeClass
     public static void startHttpd() throws Exception {
         logDir = createTempDir();