[Bug 1172467] [NEW] NetworkManager uses dnsmasq with negative DNS cache enabled

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Since NetworkManager uses dnsmasq to resolve its DNS names, it sometimes
enables the system to use dnsmasq before the network connection has been
successfully established. This causes dnsmasq to try and fail to resolve
some hostnames, it then caches them to its negative DNS cache.

To prevent this from happening I had to add no-negcache to
/etc/dnsmasq.d/network-manager

Should this be the default? I don't think any endpoint user benefits
from negative DNS cache, not even network admins as the DNS system is
robust enough to handle those.

** Affects: dnsmasq (Ubuntu)
     Importance: Undecided
         Status: New

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NetworkManager uses dnsmasq with negative DNS cache enabled
https://bugs.launchpad.net/bugs/1172467
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