Commits on Jan 23, 2019

1. Avoid race condition crash when a directory is swapped for a file …

   This commit builds off the race condition checking introduced in
   2e83199, but also correctly handles the case where a directory is
   replaced with a file before it can be walked.
   
   For example:
   1. [external] create /a/b/c.txt
   2. [watchdog] walk /a (contains directory /a/b/ at this point)
   3. [external] rm -rf /a/b/
   4. [external] touch /a/b
   5. [watchdog] walk /a/b/ (raises NotADirectoryError/ENOTDIR)
   
   Also adds a test case that runs through the above example to ensure that
   an exception is no longer raised.

   

   pR0Ps committed Jan 23, 2019
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