Add command cluster list-failure-domains

[zymap]

Master issue: #2

➜  pulsarctl git:(clusters_list_failure_domain) ./pulsarctl cluster list-failure-domains -h
USED FOR:
    This command is used for getting all failure domain under the cluster <cluster-name>.

REQUIRED PERMISSION:
    This command requires super-user permissions.

EXAMPLES:
    #listing all the failure domains under the specified cluster
    pulsarctl clusters list-failure-domains <cluster-name>

OUTPUT:
    #output example
    {
      "failure-domain": {
        "brokers": [
          "failure-broker-A",
          "failure-broker-B"
        ]
      }
    }

    #the cluster name is not specified or the cluster name is specified more than one
    [✖]  only one argument is allowed to be used as a name

    #the specified cluster does not exist in the broker
    [✖]  code: 404 reason: Cluster does not exist

Usage: pulsarctl clusters list-failure-domains [flags]

Aliases: list-failure-domains, lfd

Common flags:
  -s, --admin-service-url string    The admin web service url that pulsarctl connects to. (default "http://localhost:8080")
      --auth-params string          Authentication parameters are used to configure the public and private key files required by tls
                                     For example: "tlsCertFile:val1,tlsKeyFile:val2"
  -C, --color string                toggle colorized logs (true,false,fabulous) (default "true")
  -h, --help                        help for this command
      --tls-allow-insecure          Allow TLS insecure connection
      --tls-trust-cert-pat string   Allow TLS trust cert file path
  -v, --verbose int                 set log level, use 0 to silence, 4 for debugging (default 3)

Use 'pulsarctl clusters list-failure-domains [command] --help' for more information about a command.