Allow network reboot without using CI

https://forum.duniter.org/t/preparation-programme-sprint-25sem41-cournonsec-hackaton-sso/13375/8

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CI is not very friendly for bootstraping a new network or check that the process is still working.

Instead, adding new subcommands to xtask would allow fine-grained operations as well as make it easier to debug any issue in the process and resume it.