Use native tar command instead of tarfile.extract

Python-implemented tarfile.extractall() takes several minutes, where the
native tar command finishes in seconds. Switch over to using the native
command for speed improvements.

Bug: None
Test: act.py [...] -tc FlashTest
Change-Id: Ia79c5930860828d6ffe2e1e0988b6d093c23f967
1 file changed
tree: f923e9ed9619d467a7e84ad0a919340f2a6170d9
  1. acts/
  2. acts_tests/
  3. tools/
  4. wts-acts/
  5. Android.mk
  6. LICENSE
  7. OWNERS
  8. PREUPLOAD.cfg