Display internal flag on network inspect

Also adds internal network tests for bridge network

Signed-off-by: Chun Chen <ramichen@tencent.com>
Upstream-commit: c199506b59f60ac456cb0448ddd86e6dec92bc0a
Component: engine

components/engine/api/server/router/network/network_routes.go

@@ -164,6 +164,7 @@ func buildNetworkResource(nw libnetwork.Network) *types.NetworkResource {
 	r.Options = nw.Info().DriverOptions()
 	r.Containers = make(map[string]types.EndpointResource)
 	buildIpamResources(r, nw)
+	r.Internal = nw.Info().Internal()
 
 	epl := nw.Endpoints()
 	for _, e := range epl {