This commit fixes an issue where the partition was not properly set
on the peering query failover target created from sameness-groups.
Before this change, it was always empty, meaning that the data
would be queried with respect to the default partition always. This
resulted in a situation where a PQ that was attempting to use a
sameness-group for failover would select peers from the default
partition, rather than the partition of the sameness-group itself.
Derek Menteer