qga: Refactor common SSH functions

qga: Refactor common SSH functions

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In preparation of a Windows implementation, move the
non-POSIX specific code to commands-common-ssh.

Signed-off-by: Aidan Leuck <aidan_leuck@selinc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Dehan Meng <demeng@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Link: https://lore.kernel.org/r/20240424144029.30665-2-aidan_leuck@selinc.com
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>