redfish: Amend the retrieval of version
redfish: Amend the retrieval of version

In the redfish emulator, "/redfish/v1" returns "ServiceVersion".
However, in the HPE API explorer(*), it returns "RedfishVersion".
This commit checks both member and print the one that is available.

(*) https://ilorestfulapiexplorer.ext.hpe.com/

hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,vathpela/fwupd,hughsie/fwupd,vathpela/fwupd,fwupd/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd