dalyk 7301aa4140 Trigger NetworkCallback events when private DNS usage has changed.
Relies on events sent from netd in aosp/578162.

Test: Added tests to ConnectivityServiceTest. Added a new test
class DnsManagerTest. Built a simple app that appears to
receive onLinkProperties events correctly upon manual changes
to the private DNS settings on a Pixel.
Bug: 71828272
Change-Id: I68665aaf74b7d59182cc6f9586b80b55b0dfe427
2018-04-09 16:45:22 -04:00
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