Extending the 'hosts' listview with additional column 'IP-Adress'.

The number of column in the listview will go from 8 to 9.

This column should be configurable in the "next version", but as a starter the column / value will be static, and it will show the IP-adress of the host.

The IP-adress should be available for all hosttypes.

The column should be sortable.

See attached screenshot for graphical explanation :)

Related to: http://theforeman.org/issues/32