Add PoE support (per-port allocation/consumption and total capacity) for Brocade/Ruckus IronWare devices

[zhongfu]

Based on the Foundry PoE MIB (FDRY-POE-MIB) extracted from the FastIron 08.0.95m distribution zip, tested on a Brocade FastIron ICX6450-24-HPOE running IronWare 08.0.30t

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