* add --host and --kubeconf to `fx up` * remove `fx infra list` and `fx infra use` * put assets into skip dir for golangci * fix lint issue * upgrade go-ssh-client to consume the 'Connectable' API, enable more friendly SSH connection error message * parse 'host' and 'kubeconf' for `fx list` and `fx down` also * refactor parse * clean infra stuff