fix race condition leading to spurious 'server DOWN' events

[klaasjan]

Tried out this integration tool on our production servers and was promptly greeted with 'server down' events. It seems Zabbix takes a bit of time before finishing writing the stats file and in the meantime there is no data for the stats script. The Zabbix template assumes no data is the same as server down...

[noamik]

Really minor nitpick: "mv" isn't guaranteed to be an atomic operation.

However this fix is better than the previous code, so I'd recommend merging it.

Edit: Stupid me, I forgot about the serialization of access you introduced with your move operation.

[anapsix]

Thanks @klaasjan