jailer: move api.socket one folder higher
jailer: move api.socket one folder higher

The api.socket file create by the jailer is now in the
<exec_file_name>/<id> folder, rather than <exec_file_name>/<id>/root,
which should be used exclusively for chrooting into. This keeps more
things out of reach for the guest, which increases security.

Signed-off-by: Alexandru Agache <69826f943dd6ae0c808126caf67f094b6aee96c2@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker