keyring itself has devpi-client support

[fschulze]

I just wanted to point out, that keyring itself has a plugin hook for devpi-client to fetch passwords from your system key chain. I guess our docs should inform about that.

[hoefling]

Dang, found it now too now. Guess this project makes little sense then as I have switched to storing the passwords in keyring instead of plain-text .pypirc. @fschulze thank you for the heads-up!