commit 185098d7d56ae87408071ef42bc6b76ddabcc914
author Luke Huang <huangluke@google.com> Mon May 20 16:17:12 2019 +0800
committer Luke Huang <huangluke@google.com> Thu May 23 14:50:16 2019 +0800
tree b16f1d04ffcb4b4be2def0ce6ac70c3920622c30
parent d286198c26c3d80bfaf5f53d6faeea5d0ce6faf5

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

Change-Id: Iaeabb9330a963b30da5948494432118893e084ac