Cf parse should attempt to login instead of failing directly

[GaurangTandon]

Hi, sorry for spamming with so many requests. This isn't really urgent so feel free to take your time :)

I have noticed that if I perform cf parse without being logged in (and I have no idea why I always get logged out after a day or two), it just fails. See #11.

However, if I perform cf submit, it tries to log me back in if I am logged out.

Submit 1169 C GNU G++14 6.4.0
Not logged. Try to login
Login sigma_g...
Succeed!!
Submit 1169 C GNU G++14 6.4.0

Could similar feature be added for cf parse? I looked up the code and it seems the `loginAgain function is needed somehow.

cf-tool/cmd/cmd.go

Line 178 in 55bbcf0

func loginAgain(cfg *config.Config, cln *client.Client, err error) error {

[xalanq]

OK. I'll fix it in 30mins

[GaurangTandon]

Great thanks! :D