CLI always resets actions to default kind

If you don't specify the `--kind` on every command, then the CLI will reset back to the default:

```
$ wsk action list
actions
/19FT_dev/ping private swift:3

$ wsk action update ping ping.swift --kind swift:3.1.1
ok: updated action ping

$ wsk action list
actions
/19FT_dev/ping private swift:3.1.1

$ wsk action update ping ping.swift
ok: updated action ping

$ wsk action list
actions
/19FT_dev/ping private swift:3
```

I expect that once I've set a kind, then that action will always stay on that kind.