Fix: SO_REUSEPORT might be available but not usable
Fix: SO_REUSEPORT might be available but not usable

except on socket.error.

For refs, see:

https://github.com/circus-tent/circus/issues/699
http://bugs.python.org/issue19901

kaji-project/shinken-mod-livestatus,shinken-monitoring/mod-livestatus,staute/shinken-mod-livestatus,kaji-project/shinken-mod-livestatus,staute/shinken-mod-livestatus,shinken-monitoring/mod-livestatus