[BUG] http: fix cookie parser to support spaces and commas in values

[BUG] http: fix cookie parser to support spaces and commas in values

The cookie parser could be fooled by spaces or commas in cookie names
and values, causing the persistence cookie not to be matched if located
just after such a cookie. Now spaces found in values are considered as
part of the value, and spaces, commas and semi-colons found in values
or names, are skipped till next cookie name.

This fix must be backported to 1.3.