Log Message:
Update bind99 to 9.9.9pl6 (BIND 9.9.9-P6).

Security Fixes

     * If a server is configured with a response policy zone (RPZ) that
       rewrites an answer with local data, and is also configured for
       DNS64 address mapping, a NULL pointer can be read triggering a
       server crash. This flaw is disclosed in CVE-2017-3135. [RT #44434]
     * named could mishandle authority sections with missing RRSIGs,
       triggering an assertion failure. This flaw is disclosed in
       CVE-2016-9444. [RT #43632]
     * named mishandled some responses where covering RRSIG records were
       returned without the requested data, resulting in an assertion
       failure. This flaw is disclosed in CVE-2016-9147. [RT #43548]
     * named incorrectly tried to cache TKEY records which could trigger
       an assertion failure when there was a class mismatch. This flaw is
       disclosed in CVE-2016-9131. [RT #43522]
     * It was possible to trigger assertions when processing responses
       containing answers of type DNAME. This flaw is disclosed in
       CVE-2016-8864. [RT #43465]
     * It was possible to trigger an assertion when rendering a message
       using a specially crafted request. This flaw is disclosed in
       CVE-2016-2776. [RT #43139]
     * Calling getrrsetbyname() with a non- absolute name could trigger an
       infinite recursion bug in lwresd or named with lwres configured if,
       when combined with a search list entry from resolv.conf, the
       resulting name is too long. This flaw is disclosed in
       CVE-2016-2775. [RT #42694]

Feature Changes

     * None.

Porting Changes

     * None.

Bug Fixes

     * A synthesized CNAME record appearing in a response before the
       associated DNAME could be cached, when it should not have been.
       This was a regression introduced while addressing CVE-2016-8864.
       [RT #44318]
     * Windows installs were failing due to triggering UAC without the
       installation binary being signed.
     * A race condition in rbt/rbtdb was leading to INSISTs being
       triggered.