rest: adding the override_iptables option to the rsdl

This patch adds the override_iptables to the rsdl, in the "add host"
section. This option has been part of the API for a long time now, but
it wasn't in the rsdl, thus it wasn't exposed in the different SDKs and
the CLI.

Signed-off-by: Oved Ourfali <oourfali@redhat.com>
Change-Id: Ifc04487a940abcb659d8209156747024e94f957d