API: editing host add and update fields - exposing all stored ssh fields

Change-Id: I640cfca4057ffd65d37afc10bc5ac2e12f1aafd5
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=999640
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>