Cannot connect through SOCKS

[alpharde]

Issue description

Seabird cannot connect to a cluster that has SOCKS set up on it's proxy-url configuration.

Steps to reproduce

• Add a proxy-url field to the cluster configuration pointing to a SOCKS proxy eg:

- name: "mycluster"
  cluster:
    server: "https://myserver"
    insecure-skip-tls-verify: true
    proxy-url: socks5://127.0.0.1:1080

• Start the proxy by connecting to SSH, etc.
• Import the kubeconfig file on seabird
• It won't connect

System information

Seabird v0.5.1 @ Arch Linux