grass.gunittest: Use context manager for Popen calls in gunittest #6198
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Similar to #6197, and another yet-to-file PR, context managers can, and should, be used with Popen.
This PR addresses the similar instances in gunittest code, the code I was working on closely today.
Maybe in the near future, we would get rid of the svn calls when doing tests, but I'm not finished investigating the impacts of it.