Hide error message if nodes are MANAGEABLE before discovery
Hide error message if nodes are MANAGEABLE before discovery

Change-Id: Iab7589889146059c7ecb01b78cfebaf08d1e5528

rdo-management/instack-undercloud,bcrochet/instack-undercloud,dpkshetty/instack-undercloud,rdo-management/instack-undercloud,dmsimard/instack-undercloud,dmsimard/instack-undercloud,dpkshetty/instack-undercloud,bcrochet/instack-undercloud,eprasad/instack-undercloud,eprasad/instack-undercloud