Update sdrutils.hpp for use outside of intel-ipmi-oem

This change makes some minor improvements to match what was
up for review in phosphor-host-ipmid and removes sdrutils.hpp
dependencies on local files so it can be used outside of
intel-ipmi-oem.

Change-Id: Id126069cbe348fac4923c82f99ba96ebd7c35902
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
2 files changed