Remove all unneeded disk operations (reload TagStore, umarshal image)
for checking if image still points to same ID. Now slowest part is
queries to sqlite which hopefuly will be removed soon.
Signed-off-by: Alexander Morozov <lk4d4@docker.com>
Upstream-commit: f256d8ad2d1fbd9407d2b7a8eb69c96665c4015e
Component: engine