Don't bootloop in case apexd-issued rollback fails.

* Added ROLLBACK_FAILED apexd session state;
* In case rollback failed, apexd will try to proceed with activating
  system apexes, which sounds like a sane default;
* Since I was there, added GTEST_SKIP for rollback tests in cases
  checkpointing is enabled, as this will provide a better report when
  running atest (instead of PASSED you will see SKIPPED).

Test: atest apexservice_test
Test: remove mkidr /data/apex/backup from init.rc && \
      flashall && \
      adb push fstab-without-checkpointing /vendor/etc/fstab.taimen && \
      adb reboot && \
      adb install apex.apexd_test.apex && \
      adb push manifest_mismatch.apex /data/app-staging/session_35533440/base.apex && \
      adb reboot && \
      check session marked as ROLLBACK_FAILED
Bug: 130184133
Change-Id: I7dacd0ccc43e70b519dda9794ecdea29832bf70f
Merged-In: I7dacd0ccc43e70b519dda9794ecdea29832bf70f
(cherry picked from commit 6f87d54acc5923d14c02a3e9fadf8c6bda9a7a92)
7 files changed
tree: 7edf31df6dce3d1f372ce46f1669e1d8efa7c4ff
  1. apexd/
  2. apexer/
  3. proto/
  4. shim/
  5. tests/
  6. CleanSpec.mk
  7. OWNERS
  8. PREUPLOAD.cfg