Change docker_gwbridge subnet

Change-Id: Ibcedd2dce7a117e2cf96c4379c156d54aaec0299
diff --git a/docker/swarm/network/gwbridge.yml b/docker/swarm/network/gwbridge.yml
new file mode 100644
index 0000000..8208d3d
--- /dev/null
+++ b/docker/swarm/network/gwbridge.yml
@@ -0,0 +1,10 @@
+parameters:
+  docker:
+    swarm:
+      network:
+        docker_gwbridge:
+          subnet: ${_param:docker_gwbridge_subnet}
+          opt:
+            com.docker.network.bridge.name: docker_gwbridge
+            com.docker.network.bridge.enable_icc: false
+            com.docker.network.bridge.enable_ip_masquerade: true