//healthChek pass back health status of called vault server.
func HealthCheck(c *cli.Context) error {
    if c.GlobalString("server") != "" {
        connConfig := InitConfig(c.GlobalString("server"))
        client, err := v.NewClient(connConfig)
        if err != nil {
            log.Fatal(err)
        }
        req := client.NewRequest("GET", "/v1/sys/health")
        res, err := client.RawRequest(req)
        if err != nil {
            log.Fatal(err)
        }
        fmt.Println(res.StatusCode)
        defer res.Body.Close()
        body, err := ioutil.ReadAll(res.Body)
        fmt.Println(string(body))

    } else {
        fmt.Println("You have not entered a valid vault server/cluster address.")
    }
    return nil
}