New boot_utils.robot with wrapper for each OBMC boot test type.
New boot_utils.robot with wrapper for each OBMC boot test type.

Change-Id: I376303d952f63a3d037fd682b44b0c3af6b1a91c
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

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