core: Remove error messages from log when adding host

When we add a host 3 errors on not finding vdsManager for the host
appeared in the log. This patch fixes this issue.

Change-Id: Ia17656dbfa0e16457565b04b849eb80ea74a8949
Bug-Url: https://bugzilla.redhat.com/1062438
Signed-off-by: lzelkha@redhat.com <lzelkha@redhat.com>