move pid file from /var/run to /var/spool

The /var/run is removed at reboot, resulting system to start in unknown
state.  That is exactly wrong, the state needs to persist over reboots.

Reported-by: Kevin McNally <kevin.mcnally@travelocity.com>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
update NEWS file

Signed-off-by: Sami Kerola <kerolasa@iki.fi>