Merge branch 'ta/ensure_dir_eexist' into ccase/r13b04_dev

* ta/ensure_dir_eexist:
  filelib_SUITE: strenghten tests of filelib:ensure_dir/1
  Don't return a false {error,eexist} in filelib:ensure_dir/1

OTP-8389  Because of a race condition, using filelib:ensure_dir/1 from
          multiple processes to create the same path or parts of the same
          directory structure, filelib:ensure_dir/1 could return a
          meaningless {error,eexist}. That race condition has been
          eliminated, and {error,eexist} will now be returned only if there
          exists a regular file, device file, or some other non-directory
          file with the same name. (Thanks to Tuncer Ayaz.)

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