* This lets queues be horizontally partitioned onto
different servers, with weights assigned to each.
The queue classes used by the different partitions
can be hetereogenous or homogeneous.
* How partitioning is done is setup similar to LBFactory,
where wikis belong to sections and sections have config.
Change-Id: I44d59b67cf417dca28a3e9b25371dac5a7ffcb47
