[PATCH] pconn_lifetime

Hi all,

This patch add a new configuration option the 'pconn_lifetime' to allow
users set the desired maximum lifetime of a persistent connection.

When set, Squid will close a now-idle persistent connection that
exceeded configured lifetime instead of moving the connection into the
idle connection pool (or equivalent). No effect on ongoing/active
transactions. Connection lifetime is the time period from the connection
acceptance or opening time until "now".

This limit is useful in environments with long-lived connections where
Squid configuration or environmental factors change during a single
connection lifetime. If unrestricted, some connections may last for
hours and even days, ignoring those changes that should have affected
their behavior or their existence.

This is a Measurement Factory project