[PATCH] stage 2 of store url as fake store_url helper

- For now I am not changing the mem-obj->url and leave the branch as it
is since there is no need for it now.
Once the feature will be fine The change will be placed.

- The patch adds the helper basic surrounding code and a bit action code
to make sure it is not breaking anything.

- The point that changes everything is at the StoreEntry creation which
uses the StoreUrl and not the originalUrl.

It makes everything simpler since there is not one check that actually
should be done to validate the url else then what already in squid by
store code.

- There is a change in how helpers are started and shutdown to support
multiple helpers.

Responses are more then welcome.

Eliezer

-- 
Eliezer Croitoru
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IT consulting for Nonprofit organizations
eliezer <at> ngtech.co.il