RAC-6084: Remove indexes from system linkages. (ie ManagedBy)
RAC-6084: Remove indexes from system linkages. (ie ManagedBy)

No need to iterate over (and return) obm settings when the
/redfish/v1/managers query ignores the indexes anyway.

Redfish ServiceValidator found index issues where the ManagedBy
resources were not valid query urls.

larry-dean/on-http,larry-dean/on-http,lanchongyizu/on-http,lanchongyizu/on-http,larry-dean/on-http,keedya/on-http,RackHD/on-http,larry-dean/on-http,RackHD/on-http,RackHD/on-http,keedya/on-http,keedya/on-http,lanchongyizu/on-http,keedya/on-http,lanchongyizu/on-http,RackHD/on-http