commit 711b777bc806fab23cfe002fb9ce9fe4f310cd10
author Luke Huang <huangluke@google.com> Thu May 23 06:14:42 2019 -0700
committer Luke Huang <huangluke@google.com> Thu May 23 22:43:24 2019 +0800
tree bb42d46fcfa305027d8f9fbc4779be753fc80606
parent eb38470a805dbabd74414c3f5935dc9a68112849

Add getDnsNetId cmd in DnsProxyListener

This command is used to get the netId which resolver
will use for sending DNS query.

Correst ResponseCode.h from const to constexpr
for test.

Input:
    cmd format: getdnsnetid netId
               -netid: selected netid of the process

Output:
    Success: 1. ResponseCode::DnsProxyQueryResult
             2. dnsNetId

    Fail:    1. ResponseCode::DnsProxyQueryResult
             2. -errno

    Possible errno:
                   EINVAL
Bug: 129530368
Test: built, flashed, booted
          system/netd/tests/runtests.sh

Merged-In: Ie81751b762a780ed843bea255c1507ed03660c0e
(cherry picked from commit 4bd0e67a9568e72fe18ac4e0ab98c5bf5e6b75ee)

Change-Id: I18c4c04ab4547dc29cf97abc49ad01563e534e26