Retrieve instance password #3081

The OpenStack metadata service allows an instance to post data to an endpoint which can be retrieved with the nova get-password command.
It is meant to be an encrypted password (with the public SSH key) but it can be any plain text as well and it doesn't have to be the root password.

It could be very cool to support this feature isn't it ? What are your though about this ?
Thanks for the hard work

EDIT: Damn, I just saw that kayrus is also the maintainer of https://github.com/sapcc/nova-password ! What a boss !