1. A managed boot process system, comprising: a network; a management device that is coupled to the network; and a networking device that is coupled to the network and that includes: a storage system that includes an assured boot image, a plurality of runtime images, and a plurality of session data, wherein the assured boot image is secured in the storage system such that the assured boot image cannot be modified; a memory system that includes boot instructions; and a processing system that is configured to access the memory system to: store the plurality of session data in the storage system during a management session with the management device and prior to a reboot, wherein the management session is started while one of the plurality of runtime images is operating the networking device; perform a reboot; execute the boot instructions to load the assured boot image; restart the management session without reauthorization using the session data to provide a restarted management session that is persistent with the management session across the reboot, wherein the restarted management session is provided subsequent to loading the assured boot image and during a boot process that is performed prior to loading a runtime image; provide a graphical user interface over the network to the management device during the restarted management session and prior to the loading of the runtime image; receive a management instruction through the graphical user interface from the management device during the restarted management session and prior to the loading of the runtime image; and execute the management instruction during the restarted management session and prior to the loading of the runtime image.