Provides statistics (memory use, query counts) using the xml

statistics from BIND versions >= 9.5. Parsing of the xml is done

using [pybindxml](https://github.com/jforman/pybindxml).

BIND configuration to enable looks something like:

statistics-channels {

inet 127.0.0.1 port 8053 allow {127.0.0.1;};

};

yum-rhel6: libxml2-devel libxslt-devel