Move fs-checkpoint checking logic into InstallUtilsHost

Bug: 160296318
Test: atest StagedInstallTest
Test: atest RollbackManagerHostTest
Change-Id: Ie8be624c03f2d9b7c7a4fbeda58d0493de8bac0d
Merged-In: Ie8be624c03f2d9b7c7a4fbeda58d0493de8bac0d
(cherry picked from commit 13866a821de6427a8842d82786b71b4bcd75eea7)
5 files changed