devpi-client: 3.1.0 -> 4.1.0, fix tests

[xeji]

Motivation for this change

Build failed on Hydra: https://hydra.nixos.org/job/nixpkgs/trunk/devpi-client.x86_64-linux/all
Update to latest version, fix failing tests, reenable a previously disabled test.

ZHF #45960, please backport to 18.09.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Fits CONTRIBUTING.md.

---

cc @makefu @nlewo

[GrahamcOfBorg]

Success on x86_64-darwin (full log)

Attempted: devpi-client

Partial log (click to expand)

SKIP [1] testing/test_list_remove.py:129: devpi-server before 4.6.0 didn't support deleting single release files.
SKIP [1] testing/test_main.py:57: condition: sys.version_info < (3,)

=============================== warnings summary ===============================
<undetermined location>
  Module already imported so cannot be rewritten: _pytest.pytester

-- Docs: https://docs.pytest.org/en/latest/warnings.html
====== 188 passed, 3 skipped, 1 deselected, 1 warnings in 211.14 seconds =======
/nix/store/ih2c0493sqpcclyv6ga1b805j15dzqnb-devpi-client-4.1.0

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: devpi-client

Partial log (click to expand)

SKIP [1] /nix/store/ml2s1hjf20j5h959saf114sd35bhrn0g-devpi-server-4.4.0/lib/python2.7/site-packages/test_devpi_server/functional.py:433: Mapp implementation doesn't have 'get_simple' method.
SKIP [1] testing/test_main.py:57: condition: sys.version_info < (3,)

=============================== warnings summary ===============================
<undetermined location>
  Module already imported so cannot be rewritten: _pytest.pytester

-- Docs: https://docs.pytest.org/en/latest/warnings.html
====== 188 passed, 3 skipped, 1 deselected, 1 warnings in 233.39 seconds =======
/nix/store/4z6qdr9jcc349zml9y3cyqs0zmnz45cg-devpi-client-4.1.0

[GrahamcOfBorg]

Success on aarch64-linux (full log)

Attempted: devpi-client

Partial log (click to expand)

SKIP [1] testing/test_list_remove.py:129: devpi-server before 4.6.0 didn't support deleting single release files.
SKIP [1] testing/test_main.py:57: condition: sys.version_info < (3,)

=============================== warnings summary ===============================
<undetermined location>
  Module already imported so cannot be rewritten: _pytest.pytester

-- Docs: https://docs.pytest.org/en/latest/warnings.html
====== 188 passed, 3 skipped, 1 deselected, 1 warnings in 963.63 seconds =======
/nix/store/sbc86j0ypm7hf8ixchpfy0basss4fgzl-devpi-client-4.1.0

[makefu]

thanks!

[xeji]

backported: 9e4916b