Upgrade Firecracker to post-0.20.0

kzys · kzys · commit c721a576e591 · 2020-02-17T16:39:29.000-08:00
v0.20.0 has some issues that block firecracker-containerd to use.

Signed-off-by: Kazuyoshi Kato &lt;katokazu@amazon.com&gt;
diff --git a/_submodules/firecracker b/_submodules/firecracker
@@ -1 +1 @@
-Subproject commit 9b9030d9f4fcfd3e808166ae8ee2147a9d9249df
+Subproject commit 57ac9df0ad1260adcb1c8c53924aa4c094453ffd
