Cabinet Banks - Investigate SPS monitoring and control for AA0.5

A spike to investigate the work required to monitor and control SPS for AA0.5, including ways for Wombat to contribute.

Each SPS cabinet is powered by one of the three mains phases. To be able to sequence power control across mains phases MCCS requires a new device with a corresponding multiplicity (1 per 3 cabinets, i.e. 6 Stations). At RPFs this corresponds to 1 device per 6-Station Cluster. The name for this is TBD; possibly CabinetBank, SPSCabinetGroup or SPSCabinetUnit. It is also TBD whether this device should be at top level or in the spshw repo. Noting also that the CMB will not be used for at least AA0.5 and AA1, and that therefore COTS equipment will be filling its role, MCCS responsibilities for CMB monitoring/control may transfer to monitoring/control of these new devices. Exactly where the boundaries of responsibility fall for this new realization is TBD. Where this requires work with lower level devices there might be a role for the Wombat team. Please see here for updates to PI planning.

In addition, some review of the Architecture may be needed, and should be investigated and fixes/updates planned to address the following concerns:

• PaSD control/monitor issues identified by Wombat.
• Explore how to resolve issues on internal state definition not always being detailed enough - unknown state in particular.
• Consider integration of existing White Rabbit functionality (the precise SAT.LMC / MCCS boundary is TBD, but a WR switch device already exists)