Pass noDNS and isPluginV2 flags to plugin

- "noDNS" controls whether upon ContainerStarted event a container
  should be registered within the Weave DNS.
- "isPluginV2" will be used to determine a path to host's /proc.

plugin/net/driver.go

@@ -28,19 +28,23 @@ type network struct {
 }
 
 type driver struct {
-	name   string
-	scope  string
-	docker *docker.Client
+	name       string
+	scope      string
+	docker     *docker.Client
+	noDNS      bool
+	isPluginV2 bool
 	sync.RWMutex
 	networks map[string]network
 }
 
-func New(client *docker.Client, weave *weaveapi.Client, name, scope string) (skel.Driver, error) {
+func New(client *docker.Client, weave *weaveapi.Client, name, scope string, noDNS, isPluginV2 bool) (skel.Driver, error) {
 	driver := &driver{
-		name:     name,
-		scope:    scope,
-		docker:   client,
-		networks: make(map[string]network),
+		name:       name,
+		scope:      scope,
+		docker:     client,
+		noDNS:      noDNS,
+		isPluginV2: isPluginV2,
+		networks:   make(map[string]network),
 	}
 
 	_, err := NewWatcher(client, weave, driver)

plugin/net/watcher.go

@@ -41,9 +41,11 @@ func (w *watcher) ContainerStarted(id string) {
 			continue
 		}
 		if network.isOurs {
-			fqdn := fmt.Sprintf("%s.%s", info.Config.Hostname, info.Config.Domainname)
-			if err := w.weave.RegisterWithDNS(id, fqdn, net.IPAddress); err != nil {
-				w.driver.warn("ContainerStarted", "unable to register %s with weaveDNS: %s", id, err)
+			if !w.driver.noDNS {
+				fqdn := fmt.Sprintf("%s.%s", info.Config.Hostname, info.Config.Domainname)
+				if err := w.weave.RegisterWithDNS(id, fqdn, net.IPAddress); err != nil {
+					w.driver.warn("ContainerStarted", "unable to register %s with weaveDNS: %s", id, err)
+				}
 			}
 			if _, err := weavenet.WithNetNSByPid(info.State.Pid, "configure-arp", weavenet.VethName); err != nil {
 				w.driver.warn("ContainerStarted", "unable to configure interfaces: %s", err)