[ATFT] Change unit tests to use pyfakefs.

Use pyfakefs for fake file system operation in the unit tests.

Test: All unit tests still pass.
Bug: None
Change-Id: I9254290bfdf06a821ce1899fbff300d4fcaa4da2
1 file changed
tree: 1a761399eb0e873f9ba66d58f37e95b1552743ff
  1. at-factory-tool/
  2. atap/
  3. epid/
  4. partner-tools/
  5. MODULE_LICENSE_APACHE2
  6. NOTICE