Replace os.path.join with JoinTargetPath in security tests

Test: vts-tradefed_win run commandAndExit vts -m SecurityPoCKernelTestStaging
Bug: 36158945
Change-Id: Ief3555c95003ae3e8a43bc714814d83400702d41
1 file changed
tree: 81ea399c43517a0c8cd4317976a918a5439e89b9
  1. poc/
  2. selinux/
  3. __init__.py
  4. Android.bp
  5. Android.mk