Fix to accommodate boot flag default string change.

Default string changed from "default" to "Default".

Resolves openbmc/openbmc-test-automation#488

Change-Id: I2ba88b9700ab53feda98f91d31c33acb7c808f44
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
2 files changed