Allows for getting of status of each Rack PDU phase/bank.
The number of entries is calculated by adding
the number of phases (rPDULoadDevNumPhases OID) and
the number of banks of outlets (rPDULoadDevNumBanks)
Number of entries = #phases + #banks.
NOTE: If a device has phase and bank information, all phase information
shall precede the bank information. If a device has total information,
it shall precede both the bank and the phase information.