MINOR: proxy/http-ana: Add support of extra attributes for the cookie directive

It is now possible to insert any attribute when a cookie is inserted by
HAProxy. Any value may be set, no check is performed except the syntax validity
(CTRL chars and ';' are forbidden). For instance, it may be used to add the
SameSite attribute:

    cookie SRV insert attr "SameSite=Strict"

The attr option may be repeated to add several attributes.

This patch should fix the issue #361.

(cherry picked from commit 2f5339079b884ac8bdde166add1879ebfd9e433b)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit fac50825151ac2abc6b71343e3ffa6e0dc06c53d)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
6 files changed