qemu-ga: add ssh-{get,add,remove}-authorized-keys
Hi
Add new commands to help modify a user .ssh/authorized_keys.
Although it's possible already to modify the authorized_keys files via
file-{read,write} or exec, the commands are often denied by default, and the
logic is left to the client. Let's add specific commands for this job.
Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=1885332
v3:
- add "qga: add ssh-get-authorized-keys" & "qga: add *reset argument to
ssh-add-authorized-keys" patches
- add some fixup! patches to be squashed after review, adding 'if'
- added the reviewed-by
- misc doc improvements
v2:
- misc doc improvements
- various warnings fixes
- fix build for !unix
- added reviewed-by