Make Network MTU writable assuming that the net-mtu-writable extension is enabled

core/src/main/java/org/openstack4j/model/network/NetworkUpdate.java

@@ -31,5 +31,11 @@ public interface NetworkUpdate extends ModelEntity, Buildable<NetworkUpdateBuild
      * @return true if this network is shared
      */
     boolean isShared();
-
+
+    /**
+     * Requires the net-mtu-writable extension
+     *
+     * @return the MTU value to update on the network
+     */
+    Integer getMTU();
 }

core/src/main/java/org/openstack4j/model/network/builder/NetworkBuilder.java

@@ -55,4 +55,11 @@ public interface NetworkBuilder extends Builder<NetworkBuilder, Network> {
 	 * @see Network#getAvailabilityZoneHints()
 	 */
 	NetworkBuilder addAvailabilityZoneHints(String availabilityZone);
+
+	/**
+	 * Requires the net-mtu-writable extension
+	 *
+	 * @see Network#getMTU()
+	 */
+	NetworkBuilder mtu(Integer mtu);
 }

core/src/main/java/org/openstack4j/model/network/builder/NetworkUpdateBuilder.java

@@ -33,4 +33,12 @@ public interface NetworkUpdateBuilder extends Builder<NetworkUpdateBuilder, Netw
      * @return the builder
      */
     NetworkUpdateBuilder shared(boolean shared);
+
+    /**
+     * Requires the net-mtu-writable extension
+     *
+     * @param mtu MTU integer
+     * @return the builder
+     */
+    NetworkUpdateBuilder mtu(Integer mtu);
 }

core/src/main/java/org/openstack4j/openstack/networking/domain/NeutronNetwork.java

@@ -350,6 +350,12 @@ public NetworkBuilder isRouterExternal(boolean routerExternal) {
             return this;
         }
 
+        @Override
+        public NetworkBuilder mtu(Integer mtu) {
+            m.mtu = mtu;
+            return this;
+        }
+
         @Override
         public Network build() {
             return m;

core/src/main/java/org/openstack4j/openstack/networking/domain/NeutronNetworkUpdate.java

@@ -25,6 +25,9 @@ public class NeutronNetworkUpdate implements NetworkUpdate {
     @JsonProperty("admin_state_up")
     private Boolean adminStateUp;
 
+    @JsonProperty("mtu")
+    private Integer mtu;
+
     public static NetworkUpdateBuilder builder() {
         return new NetworkUpdateConcreteBuilder();
     }
@@ -51,6 +54,12 @@ public boolean isShared() {
         return shared == null ? false : shared;
     }
 
+    @JsonIgnore
+    @Override
+    public Integer getMTU() {
+        return mtu;
+    }
+
     @Override
     public String toString() {
         return MoreObjects.toStringHelper(this).omitNullValues()
@@ -99,5 +108,10 @@ public NetworkUpdateBuilder shared(boolean shared) {
             return this;
         }
 
+        @Override
+        public NetworkUpdateBuilder mtu(Integer mtu) {
+            model.mtu = mtu;
+            return this;
+        }
     }
 }