Add a comment to rpc.queue_get_for().
Add a comment to rpc.queue_get_for().

Part of blueprint common-rpc.

Add a comment to the rpc.queue_get_for() function that notes that this
is simply a naming convention and is dependent on how queues are set up
on the consumer side.

Change-Id: Ifa7d648e9b33ad2416236dc6966527c257baaf88

n0ano/ganttclient