[MINOR] cookie: add options "maxidle" and "maxlife"

Add two new arguments to the "cookie" keyword, to be able to
fix a max idle and max life on them. Right now only the parameter
parsing is implemented.
(cherry picked from commit 9ad5dec4c3bb8f29129f292cb22d3fc495fcc98a)
diff --git a/include/types/proxy.h b/include/types/proxy.h
index 46b61a2..246a9be 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -200,6 +200,8 @@
 	char *cookie_domain;			/* domain used to insert the cookie */
 	char *cookie_name;			/* name of the cookie to look for */
 	int  cookie_len;			/* strlen(cookie_name), computed only once */
+	unsigned int cookie_maxidle;		/* max idle time for this cookie */
+	unsigned int cookie_maxlife;		/* max life time for this cookie */
 	char *rdp_cookie_name;			/* name of the RDP cookie to look for */
 	int  rdp_cookie_len;			/* strlen(rdp_cookie_name), computed only once */
 	char *url_param_name;			/* name of the URL parameter used for hashing */