[PATCH/RFC] Use submodule for dnspython

[Jelmer Vernooij]

TL;DR: This patch removes our copy of dnspython from the tree and instead
puts a submodule in place.

Benefits
========

This should make updates of external libraries (just dnspython for
now) easier to review in the future as you'll just see a one-line diff
updating it to a new upstream SHA. This way we can also easily verify we don't
have any local changes.

We currently use a mirror of the upstream dnspython repository that is
hosted on git.samba.org - just in case upstream changes their URL.

What changes for users
======================

A consequence of this is that if "dnspython" is not installed on the
system and if samba wasn't cloned using 'git clone --recursive',
the user will get the following message during configure:

  ERROR: Unable to find Python module 'dnspython'. Please install the
  system package or check out the relevant submodule by running
  'git submodule update --init'.

(Previously Samba would automatically use the bundled version)

Cheers,

Jelmer
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