Log Message:
py-fakefs: updated to 3.7.2

Version 3.7.2
This version backports some fixes from master.

Fixes
* Fixed handling of relative paths in `lresolve` / `os.lstat`
* Fixed `os.walk` if path ends with path separator
* Fixed handling of empty path in `os.makedirs`
* Fixed handling of `os.TMPFILE` flag under Linux
* Fixed behavior of `os.makedirs` in write-protected directory