[GRASS-git] [OSGeo/grass] 2fd5a5: grass.gunittest: Use more Python 3 style code (#2181)

[Vaclav Petras]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 2fd5a5337f660e80e7177f2930182f49bb63d45e
      https://github.com/OSGeo/grass/commit/2fd5a5337f660e80e7177f2930182f49bb63d45e
  Author: Vaclav Petras <wenzeslaus at gmail.com>
  Date:   2022-02-08 (Tue, 08 Feb 2022)

  Changed paths:
    M python/grass/gunittest/main.py

  Log Message:
  -----------
  grass.gunittest: Use more Python 3 style code (#2181)

* Use f-strings for simple string formatting.
* Use with statement for open.
* Simply return from main as in other parts of the function.
* Order imports better.
* Update to new import alias.