www: Use SIGUSR2 instead of SIGUSR1 to dump session state
www: Use SIGUSR2 instead of SIGUSR1 to dump session state

According to the fastcgi faq, SIGUSR1 is used by Apache/mod_fastcgi to
tell the application to do a graceful shutdown. Even though we're not
running that way, we may as well remove any potential conflict.

Signed-off-by: Andrew Clayton <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@opentechlabs.co.uk>

ac000/receiptomatic