[FEATURE] Implement updating firmware without needing to host HTTP server

[davidallendj]

Description of Issue

Updating firmware using the Redfish API requires that a firmware URL be provided to initiate the update process, thus requiring a server to be hosted. The specification does not allow pointing to firmware with the file:// scheme and only allows for HTTP(S) and FTP downloads (to my knowledge).

Possible Solution

One solution to this issue would be for magellan to host its own server internally where the command is called. Therefore, instead of having to specify a URL, the user can specify a path and the tool will handle the rest.

Migrated from https://github.com/bikeshack/magellan/issues/16