Making the DnsException constructor public is useful for apps
using DnsResolver to write their tests, and for internal packages
that may want to implement the DnsResolver.Callback interface.
Test: for regression; CTS tests in b/208479811
Bug: 208464882
Change-Id: I14641688f53721c96e6df9596a7506912ba3aec0
Most DNS fails are caused by network issues, like connection timed out.
Lower log severity from error to warning to conform to go/greenlog.
Test: 1. connect to a WiFi AP without WAN
2. atest CtsNetTestCases:android.net.cts.DnsResolverTest
3. adb logcat | grep resNetworkResult:android
Bug: 181269159
Change-Id: Ifeaf250c91a4b9123d200bd62f085c11009f2491
Files that are planned to be part of the connectivity module are grouped
in packages/Connectivity, so they can be built separately and moved in
one operation with their history into packages/modules/Connectivity.
This places the files in the existing framework-connectivity-sources
filegroup instead of the current framework-core-sources filegroup. Both
are used the same way in framework-non-updatable-sources.
Bug: 171540887
Test: m
Change-Id: I62d9d91574ace6f5c4624035d190260c3126b91e
