pythonPackages.ansible: Add netaddr dependency

This commit adds support for ansible's "ipaddr" filter

pkgs/top-level/python-packages.nix

···
 
     propagatedBuildInputs = with self; [
       pycrypto paramiko jinja2 pyyaml httplib2 boto six
+      netaddr
     ] ++ optional windowsSupport pywinrm;
 
     meta = {