Expand functionality of `sched-fluxion-resource.set_status` service.

[jameshcorbett]

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PR #1110 added a service for marking vertices as up or down. The service only accepts a single vertex. It would be more flexible if it could accept a dictionary, with keys being the vertex path and values being the string "up" or "down." Or alternatively two lists, one "up" and the other "down."