ITS: enable camera lists w/ run_all_tests.py

We are supposed to handle:
  python tools/run_all_tests.py device=#
  python tools/run_all_tests.py device=# camera=#
  python tools/run_all_tests.py device=# camera=#,#,#
Current scripts do not handle (1) or (3).
(1) will try to extract chart on camera=0 for all cameras in scene3.
(3) will fail because parts of code expect only camera=#.

bug: 118685623

Change-Id: I98cdcd920f1b4be0900bba6d0501a7bf873aeee7
Merged-In: I7300f34dda29b626f7de11bc2989ecc9cea77f4e