[ATFT] Change unit tests to use pyfakefs. am: 7712c6c2d4
am: 8056886913

Change-Id: I5f589b50c9b8d5de955c44fd4689518f6842bdce
tree: 1a761399eb0e873f9ba66d58f37e95b1552743ff
  1. at-factory-tool/
  2. atap/
  3. epid/
  4. partner-tools/
  5. MODULE_LICENSE_APACHE2
  6. NOTICE