bootstat: test reboot rescueparty

This test fails on most devices, gives us a report of devices that
do not propagate the boot reason via the bootloader.  This should
become a bootloader required test.

Test: boot_reason_test.sh optional_rescueparty
Change-Id: Ibdc7b23b025e5d89d659ff08083b2e071343923c
1 file changed