Support multiattach property in volume

core-test/src/main/java/org/openstack4j/api/storage/VolumeTests.java

@@ -10,9 +10,11 @@
 
 import okhttp3.mockwebserver.RecordedRequest;
 import org.openstack4j.api.AbstractTest;
+import org.openstack4j.api.Builders;
 import org.openstack4j.api.SkipTest;
 import org.openstack4j.model.storage.block.Volume;
 import org.openstack4j.model.storage.block.VolumeAttachment;
+import org.openstack4j.model.storage.block.builder.VolumeBuilder;
 import org.testng.annotations.Test;
 
 
@@ -141,4 +143,23 @@ public void testVolumesWithBootableAndEncyrpted() throws Exception {
 
 
     }
+
+
+    @Test
+    public void CreateVolumeV2WithMultiattach() throws Exception {
+
+        respondWith("/storage/v2/createVolume-muitiattach.json");
+
+        VolumeBuilder volumeBuilder = Builders.volume();
+		volumeBuilder.size(10);
+		volumeBuilder.name("test_openstack4j");
+		volumeBuilder.description("test");
+		volumeBuilder.multiattach(true);	
+		Volume volume = osv2().blockStorage().volumes().create(volumeBuilder.build());
+
+		server.takeRequest();	 
+
+        assertEquals(volume.getSize(), 10);               
+        assertEquals(volume.multiattach(), Boolean.TRUE);                        
+    }
 }

core-test/src/main/resources/storage/v2/createVolume-muitiattach.json

@@ -0,0 +1,12 @@
+{
+    "volume": {
+        "id" : "ac9ae248-cf21-4301-87b1-568ff20a0a02", 
+		"status" : "creating", 
+		"size" : 10, 
+		"zone" : "nova", 
+		"created" : "Wed Aug 16 13:27:14 KST 2017", 
+		"multiattach" : true, 
+		"metadata" : {}, 
+		"bootable" :  false
+    }
+}

core/src/main/java/org/openstack4j/model/storage/block/Volume.java

@@ -137,6 +137,11 @@ public static MigrationStatus fromValue(String migrationStatus) {
 	 * @return the image reference identifier (if an image was associated) otherwise null
 	 */
 	String getImageRef();
+
+	/**
+	 * @return To enable this volume to attach
+	 */
+	Boolean multiattach();
 
 	/**
 	 * @return ID of source volume to clone from

core/src/main/java/org/openstack4j/model/storage/block/builder/VolumeBuilder.java

@@ -52,6 +52,14 @@ public interface VolumeBuilder extends Builder<VolumeBuilder, Volume> {
 	 */
 	VolumeBuilder imageRef(String imageRef);
 
+	/**
+	 * To enable this volume to attach to more than one server <b>Optional</b>
+	 * 
+	 * @param To enable this volume to attach to more than one server set this value to true
+	 * @return VolumeBuilder
+	 */
+	VolumeBuilder multiattach(Boolean multiattach);
+
 	/**
 	 * The size of the volume, in GB.
 	 * 

core/src/main/java/org/openstack4j/openstack/storage/block/domain/CinderVolume.java

@@ -47,6 +47,8 @@ public class CinderVolume implements Volume {
 	private String volumeType;
 	@JsonProperty("imageRef")
 	private String imageRef;
+	@JsonProperty("multiattach")
+	private Boolean multiattach;
 	@JsonProperty("source_volid")
 	private String sourceVolid;
 	@JsonProperty("snapshot_id")
@@ -196,6 +198,14 @@ public String getImageRef() {
 	    return imageId;
 	}
 
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public Boolean multiattach(){
+		return multiattach;
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */
@@ -259,7 +269,7 @@ public String toString() {
 		return MoreObjects.toStringHelper(this).omitNullValues()
 				     .add("id", id).add("name", name).add("description", description)
 				     .add("status", status).add("size", size).add("zone", zone).add("created", created)
-				     .add("volumeType", volumeType).add("imageRef", getImageRef())
+				     .add("volumeType", volumeType).add("imageRef", getImageRef()).add("multiattach", multiattach)
 				     .add("sourceVolid", sourceVolid).add("snapshotId", snapshotId).add("metadata", metadata)
 				     .add("bootable", bootable)
 				     .toString();
@@ -321,6 +331,12 @@ public VolumeBuilder imageRef(String imageRef) {
 			m.imageRef = imageRef;
 			return this;
 		}
+
+		@Override
+		public VolumeBuilder multiattach(Boolean multiattach) {
+			m.multiattach = multiattach;
+			return this;
+		}
 
 		@Override
 		public VolumeBuilder size(int size) {