Navigator should be able to prepare databases for kubelet node reboots

[wallrj]

An issue to remind us of a discussion we had about "Before and After Reboot Checks" in https://github.com/coreos/container-linux-update-operator

• https://github.com/coreos/container-linux-update-operator/blob/master/doc/before-after-reboot-checks.md
  • https://github.com/coreos/container-linux-update-operator
  • https://github.com/coreos/update_engine
  • https://github.com/coreos/locksmith

/kind feature