Add discovered IP address to provision call

In later patch we add to the vds address field the fqdn of the
discovered host before the host is provisioned. in the provision call
foreman needs the original discovered IP address.
Therefore this patch saves the ip and pass it when the provision call is
done.

Change-Id: I915ed42da851a60a6480f68735b005ab4c3f4a4b
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1165668
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>