k3s: avoid over-quoting install envvars (rancher#590)

Fix K3S_URL, K3S_TOKEN, and K3S_CLUSTER_SECRET being passed to k3s
install.sh with extra quotes around the values. Rely on k3s install.sh
to correctly capture entries for `/etc/k3s/k3s-service.env`.

Fixes rancher#589

pkg/cc/funcs.go

@@ -122,16 +122,16 @@ func ApplyK3S(cfg *config.CloudConfig, restart, install bool) error {
  args = append(args, "server")
  }
  } else {
- vars = append(vars, fmt.Sprintf("K3S_URL=\"%s\"\n", cfg.K3OS.ServerURL))
+ vars = append(vars, fmt.Sprintf("K3S_URL=%s", cfg.K3OS.ServerURL))
  if len(args) == 0 {
  args = append(args, "agent")
  }
  }
 
  if strings.HasPrefix(cfg.K3OS.Token, "K10") {
- vars = append(vars, fmt.Sprintf("K3S_TOKEN=\"%s\"\n", cfg.K3OS.Token))
+ vars = append(vars, fmt.Sprintf("K3S_TOKEN=%s", cfg.K3OS.Token))
  } else if cfg.K3OS.Token != "" {
- vars = append(vars, fmt.Sprintf("K3S_CLUSTER_SECRET=\"%s\"\n", cfg.K3OS.Token))
+ vars = append(vars, fmt.Sprintf("K3S_CLUSTER_SECRET=%s", cfg.K3OS.Token))
  }
 
  var labels []string