Remove dependency on libnetd_client

NetworkUtils can just use the NDK to achieve the same.

Also make sure network handles can have the local nameservers flag, for
the JNI API, and create/parse them accordingly in Network.

Original change (project moved):
I2e7b78263f7ca0cab9458854858a7423f6bd2854

Bug: 171540887
Test: atest CtsNetTestCases (in particular MultinetworkApiTest,
          DnsResolverTest, NetworkTest)
Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f
Change-Id: I7a523aac93094beef6ff40d50678c12fe8840940
4 files changed