Restore support for old XCC update API
Restore support for old XCC update API

Oldest XCCs return different data to unsupported APIs, so
modify to support three variants, no return, return 2, and
the latest that require support for the return code.

Change-Id: I8d04cfffa42ff9b70bd4a19e32b353c0c7be5544

openstack/pyghmi,openstack/pyghmi,stackforge/pyghmi