ExtractImageIDsFromSourcePod takes the VMI and its source pod to determine the exact image used by containerdisks and boot container images, which is recorded in the status section of a started pod; if the status section does not contain this info the tag is used.

GetDiskTargetPartFromLauncherView returns (path to disk image, image type, and error).

NewKernelBootSocketPathGetter get the socket pat of the kernel-boot containerDisk.

NewSocketPathGetter get the socket pat of a containerDisk.

SetLocalDirectoryOnly TODO: Refactor this package.