commit 69615f6e6b1f55fa2b8b994c196458849e227183
author Mike Yu <yumike@google.com> Tue Nov 06 15:42:36 2018 +0800
committer Mike Yu <yumike@google.com> Wed Nov 14 16:40:48 2018 +0800
tree ae4c2ec0ecadb8811ed78e38eac17d5e777b86dc
parent ab501f188abc2c5691d0c8e2cc1c22efa591569f

Expose DNS timeout error to netd

For resolver stats, RCODE_TIMEOUT has been used for catching DNS timeout
error. This change adds the Support for reporting NETD_RESOLV_TIMEOUT to
frameworks.

Also clean up res_data.cpp as these functions are not used.
  - res_init
  - res_mkquery
  - res_query
  - res_send
  - res_search

Bug: 113916551
Test: as follows
    - built and flash netd
    - system/netd/tests/runtests.sh passed
    - silently drop packets by iptables, the return error is correct
Change-Id: I62ba6759b519d42aef62ae5b756a3c1ae3cb00d8