Multiple DCs: Add a new peek cursor for satellites that uses the fact that all locations are best locations

Satellite logs have pre-assigned teams for each tag. This means the logs on the team for a given tag each have all the data for that tag. If the server returned by bestServerLocation is down, instead of merging the results from all other logs we should peek from one of the other team members.

Locate bestServerLocation and the satellite peek-cursor path, then read how results are merged when the selected server is unavailable. Done means a satellite can peek from another member of the pre-assigned team for that tag instead of merging results from all other logs.

Written by the indexing model from the issue text.