Bug 588796

Description of problem:

Trying to understand low latency grid and get it to work from the documentation is difficult.

1. It is unclear from the docs that the config settings are only for
execution nodes. It may be obvious to engineering but we ought to explain
how due to the nature of the job submission through qpid that there is no
extra configuration for non-execution nodes.

2. It's worth a short description of every line of the configuration.

3. As an extra it might be worth explaining that you carve up you low-lat
pool of execute nodes into different priorities and or projects etc. This
can be done by providing different values for the queue name. So instead of
one 'grid' you could have 'grid_high' and 'grid-low'. The client program can
use the appropriate routing-key to get to the queue. Actually in the new API
the can just send to the grid-high or grid-low node. (Btw I would regard
this as much out-of-the-box as the current single example.

In summary: over do the information and explanations. It's better to give
too much than too little.

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