common: Update installation mask for factory images.

The installation mask for factory images were out-dated.

- FACTORY_TEST_INSTALL_MASK should be removed since "factory_test" image
  has been deprecated by real test images.

- FACTORY_SHIM_INSTALL_MASK should be updated:
  1. Whole /opt can be removed because we don't use memento updater anymore.
  2. Legacy IME folder are no longer included (chewing, ibus-pinyin,
     libhangul, m17n, pyzy).
  3. Images from assets can be included because now we always use frecon.
  4. autotest-pkgs and python2.6 no longer exists.

BUG=None
TEST=build_image factory_install

Change-Id: Ib8ce80546a3aa9ee304238a3842f8c4c05c523d5
Reviewed-on: https://chromium-review.googlesource.com/575255
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2 files changed