iproute2: Add static and autoconf ipv6 support

This patch enables the users of the iproute2 configurator to set
ipv6 static addresses or change the ipv6 autoconf status of the
an interface.

Change-Id: I372212dd9abc1dbb2ce4d966ef25726a439ac166
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27189
Reviewed-by: Dan Kenigsberg <danken@redhat.com>