Please backport pdns 3.3.1-4 (universe) from utopic

Please backport pdns 3.3.1-4 (universe) from utopic to trusty.

Reason for the backport:
========================
Upstream has released a mostly bugfix release a long time ago, but because of bad timing and other stuff it didn't make it into Debian for a long time, and by extension not into trusty.

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s utopic -d trusty pdns

* trusty:
[X] Package builds without modification
[X] pdns-backend-pipe installs cleanly and runs
[X] pdns-server-dbg installs cleanly and runs
[X] pdns-server installs cleanly and runs
[X] pdns-backend-sqlite3 installs cleanly and runs
[X] pdns-backend-ldap installs cleanly and runs
[X] pdns-backend-geo installs cleanly and runs
[X] pdns-backend-lua installs cleanly and runs
[X] pdns-backend-mysql installs cleanly and runs
[X] pdns-backend-pgsql installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of pdns. For reverse-build-dependencies (-Indep), please test that the package still builds against the new pdns. For reverse-dependencies, please test that the version of the package currently in the release still works with the new pdns installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

pdns-backend-pipe
-----------------

pdns-backend-pgsql
------------------

pdns-server
-----------
* collectd-core
  [ ] trusty (Reverse-Suggests)

pdns-backend-sqlite3
--------------------

pdns-backend-ldap
-----------------

pdns-backend-geo
----------------

pdns-backend-lua
----------------

pdns-backend-mysql
------------------

pdns-server-dbg
---------------