Add Rancher provider again

pkg/provider/rancher/label.go

@@ -0,0 +1,23 @@
+package rancher
+
+import (
+	"github.com/containous/traefik/pkg/provider/label"
+)
+
+type configuration struct {
+	Enable bool
+	Tags   []string
+}
+
+func (p *Provider) getConfiguration(service rancherData) (configuration, error) {
+	conf := configuration{
+		Enable: p.ExposedByDefault,
+	}
+
+	err := label.Decode(service.Labels, &conf, "traefik.rancher.", "traefik.enable", "traefik.tags")
+	if err != nil {
+		return configuration{}, err
+	}
+
+	return conf, nil
+}