Commits on May 5, 2021

1. Fix directory creation race condition in Folder and SandboxFolder …

   The `Folder` and `SandboxFolder` classes of `aiida.common.folders` used
   the following paradigm to create the required folders:
   
       if not os.path.exists(filepath):
           os.makedirs(filepath)
   
   However, this is susceptible to a race condition. If two processes call
   the same piece of code almost at the same time, they may both evaluate
   the conditional to be True if the filepath does not yet exist, but one
   of the two will actually get to the creation first, causing the second
   process to except with a `FileExistsError`.
   
   The solution is to replace it with `os.makedirs(filepath, exist_ok=True)`
   which will swallow the exception if the path already exists.

   

   sphuber committed May 5, 2021
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