HDDS-1841. Fix TestSecureContainerServer. (#1136)

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/container/server/TestSecureContainerServer.java

@@ -34,6 +34,7 @@ import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
 import org.apache.hadoop.hdds.security.exception.SCMSecurityException;
 import org.apache.hadoop.hdds.security.token.OzoneBlockTokenIdentifier;
 import org.apache.hadoop.hdds.security.x509.SecurityConfig;
+import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
 import org.apache.hadoop.ozone.RatisTestHelper;
 import org.apache.hadoop.ozone.client.CertificateClientTestImpl;
@@ -97,6 +98,7 @@ public class TestSecureContainerServer {
 
   @BeforeClass
   static public void setup() throws Exception {
+    DefaultMetricsSystem.setMiniClusterMode(true);
     CONF.set(HddsConfigKeys.HDDS_METADATA_DIR_NAME, TEST_DIR);
     CONF.setBoolean(OZONE_SECURITY_ENABLED_KEY, true);
     CONF.setBoolean(HDDS_BLOCK_TOKEN_ENABLED, true);