podman machine ssh handling

add the key used in newly initialized machines to the user's known_hosts file. This ensures that golang will be able to ssh into the machine using
podman-remote. Also, remove the /dev/null redirection for podman machine ssh's known_hosts file.

resolves #15347

Signed-off-by: Charlie Doern <cdoern@redhat.com>
Signed-off-by: cdoern <cbdoer23@g.holycross.edu>
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