obmc_boot_test: gen_robot_valid to gen_valid
obmc_boot_test: gen_robot_valid to gen_valid

Since obmc_boot_test is written in python, it can access gen_valid
functions directly (i.e. it need not use the gen_robot_valid wrapper
versions).

Change-Id: Idf35c48205f9bc549b336363d103e73761154e13
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation