Merge pull request #1087 from HuijingHei/fix-raid-test

test: add `layout` for raid1 test

Author: cgwalters

tests/kola/raid1/config.bu

@@ -1,6 +1,8 @@
 variant: fcos
 version: 1.5.0
 boot_device:
+  # The {{LAYOUT}} will be replaced by https://github.com/coreos/coreos-assembler/pull/4525
+  layout: {{LAYOUT}}
   mirror:
     devices:
       - /dev/vda