tree fa6ea055156e1ea6c872dcf40a50f59a8896a485
author Bernie Innocenti <codewiz@google.com> 1535569520 +0900
committer Bernie Innocenti <codewiz@google.com> 1536293436 +0900

Import verbatim DNS resolver code from bionic

This is a snapshot of the minimal set of resolver modules which are
needed by netd. All files were taken verbatim from bionic's aosp tree
at commit 3e5a32ce2c24969932634d84e2755755094fa582.

Test: does not even compile yet!
Change-Id: I4a5e6dc70bdf2b5f6772ef169c3a70cad6f13006