Thomas Waldmann 6bf1f57fc1 deal with not responding nameservers (offline or unreachable)
if a nameserver does not respond, we flag it in the database
(available = False) and stop talking to it for 5 minutes.

after 5 minutes, we flag it available = True again and retry talking to it
(and if not successful, flag it as unavailable again).

this avoids a unresponsive UI as we do a lot of ns queries from the templates
to get v4 and v6 addresses of our hosts from master nameservers.

we log a warning when setting unavailable and a info when setting available.
2013-10-27 05:14:47 +01:00
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