[dev] more permissive ngx_http_variables_init_vars

[Manlio Perillo]

Hi.

I have written a module that make available some "undeclared" variables, 
using the same method used for `http_`, `sent_http_` and 
`upstream_http_` variables.

These variables have prefix `cookie_` and `args_`.
As an example:
   $cookie_name
returns the value of the cookied named "name".

Unfortunately, my module does not works without a patch to nginx (the 
patch is attached.

The patch is very simple: instead of returning an error when an "unknow" 
variable is seen, it first checks if it has a get_handler attached.

These variables are still "second class citizen", since they are not 
supported by the `ngx_http_get_variable` function (this function is
used by the SSI module, and may be used by a perl handler).

This is not a problem; moreover I can add directives for explicitly 
declare these variables:
   parsed_cookie_set name;
will add the `cookie_name` variable.


Igor, what I would like to know is if the patch is correct and if it is 
possible to have it integrated in nginx.



Thanks  Manlio Perillo
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