Todo "dpid_idle_timeout variable to dpidrc" and config parsing generally

Hello all,

In dpid/dpid.c at about line 204, there is a todo, that
dpid_idle_timeout should be configurable.

I looked at how to do this sympathetically with the existing code and
blocked, because the configuration file is:
- having its location calculated
- being opened
- being scanned into heap memory
several times in the existing code.

My over-response is to write a library to:
- private memory-map it
- parse it into a linked-list in the comments in the file
and
- have everyone who traversed the file now traverse the linked-list

On the way, we get new functionality:
- the ability to record the use of a configuration item
- the ability to report on unused configuration items
-- which are interesting because they're probably typos

Parsing dillorc with the default options uncommented, this approach is
about 4* faster than the existing approach.  I think that it will also
have a smaller VM footprint, because we are already paying for cooked
disk buffers for the same amount of file, more times.

The diff is 1400 lines, so I don't expect instant rejoicing :-)

The attached file contains my test-cases, shell scripts to generate
some of them, that are tricky, and the diff which inserts the code
into revision b185e43.

Regards,
James.

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