Roll out error message utils

This code should really be in a cpp/hpp file, not in a generated python
script. The python script housed this temporarily to allow us to
generate the registries. It's

Roll out error message utils

This code should really be in a cpp/hpp file, not in a generated python
script. The python script housed this temporarily to allow us to
generate the registries. It's time to roll it out.

Tested: Message registries generate successfully on GET. Redfish
service validator passes.

Change-Id: I7aca2d0a7fac6d530511421b667ff732617df61e
Signed-off-by: Ed Tanous <etanous@nvidia.com>

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