Move around code for better clarity

pkg/docker/client.go

@@ -0,0 +1,29 @@
+package docker
+
+import (
+	dockerClient "github.com/docker/engine-api/client"
+	"github.com/rancher/os/config"
+	"golang.org/x/net/context"
+)
+
+func NewSystemClient() (dockerClient.APIClient, error) {
+	return NewClient(config.SystemDockerHost)
+}
+
+func NewDefaultClient() (dockerClient.APIClient, error) {
+	return NewClient(config.DockerHost)
+}
+
+func NewClient(endpoint string) (dockerClient.APIClient, error) {
+	client, err := dockerClient.NewClient(endpoint, "", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	err = ClientOK(endpoint, func() bool {
+		_, err := client.Info(context.Background())
+		return err == nil
+	})
+
+	return client, err
+}