Blacklist versions as part of Rollback along with unittests.

This CL adds version blacklisting as part of AU Rollback. A few additional
things:

1) Since this pref must persist across rollback I have introduced a
powerwash_safe_prefs as part of system_state that will persist across
powerwashes.
2) Fixed bug where we needed to read the device policy (which is read during an
update_check before Rollback would work).
3) Some refactoring to move pref constants to constants.
4) Passing keepimg into our powerwash command so we don't wipe the old
partitions.

BUG=chromium:252589 chromium:254217
TEST=Unittests + test on device + using rollback with and without powerwash
checking preserve state.

Change-Id: I991fad944594944425fd9941e10b30a919f2b83b
Reviewed-on: https://gerrit.chromium.org/gerrit/59518
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Chris Sosa <sosa@chromium.org>
diff --git a/system_state.h b/system_state.h
index 4f3c98f..56d38a6 100644
--- a/system_state.h
+++ b/system_state.h
@@ -60,6 +60,12 @@
   // Gets the interface object for persisted store.
   virtual PrefsInterface* prefs() = 0;
 
+  // Gets the interface object for the persisted store that persists across
+  // powerwashes. Please note that this should be used very seldomly and must
+  // be forwards and backwards compatible as powerwash is used to go back and
+  // forth in system versions.
+  virtual PrefsInterface* powerwash_safe_prefs() = 0;
+
   // Gets the interface for the payload state object.
   virtual PayloadStateInterface* payload_state() = 0;