testcases/PetitbootConfig: Test Petitboot Configuration UI
testcases/PetitbootConfig: Test Petitboot Configuration UI

A few tests to navigate around the System Configuration screen and check
that settings are properly saved to NVRAM.

Signed-off-by: Samuel Mendoza-Jonas <f16bed56189e249fe4ca8ed10a1ecae60e8ceac0@mendozajonas.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework