firecracker-v0.1.yaml: updated
firecracker-v0.1.yaml: updated

Update Swagger definition in firecracker-v0.1.yaml to include the
description of newly added GET /actions/{action_id} functionality.

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

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