[PATCH] url_rewrite_extras for redirector helpers

Hi all,

This patch add the url_rewrite_extras for redirector helpers.
The url_rewrite_extras is a "quoted string" with logformat %macro
support. It is appended to request line for redirector helpers.

Example usage:
   url_rewrite_extras "Note1=%{Note1}note Note2=%{Note2}note"

The url_rewrtite_extras it is similar to the "key_extras" authenticator
helpers options. Originally developed to allow notes exchange between
authenicator helpers and redirector helpers.

In this patch we add a new type for cf.data the TokenOrQuotedString to
allow new configurations use quoted strings for the new option without
explicitly turning configuration_includes_quoted_values on.

This is a Measurement Factory project.