Update to nixops 2.0, python3, poetry, types

[grahamc]

Consider reviewing commit by commit.

[tool.poetry]
name = "foobar"
version = "0.1.0"
description = ""
authors = ["Graham Christensen <graham@grahamc.com>"]

[tool.poetry.dependencies]
python = "^3.7"
nixops = {git = "https://github.com/NixOS/nixops.git", rev = "master"}
nixops-packet = {path = "./nixops-packet"}

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

then poetry install then poetry shell then nixops deploy worked for me here :)