HDDS-2065. Implement OMNodeDetails#toString

Closes #1387

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OMNodeDetails.java

@@ -54,6 +54,19 @@ public final class OMNodeDetails {
     this.httpsAddress = httpsAddress;
   }
 
+  @Override
+  public String toString() {
+    return "OMNodeDetails["
+        + "omServiceId=" + omServiceId +
+        ", omNodeId=" + omNodeId +
+        ", rpcAddress=" + rpcAddress +
+        ", rpcPort=" + rpcPort +
+        ", ratisPort=" + ratisPort +
+        ", httpAddress=" + httpAddress +
+        ", httpsAddress=" + httpsAddress +
+        "]";
+  }
+
   /**
    * Builder class for OMNodeDetails.
    */