VSSD: report success if not all VS fail in enum
VSSD: report success if not all VS fail in enum

  Original code 'continue' in the 'for' in return_enum_vssd() when
one VSDS fail in retrieving, but forgot to set s to normal. This patch
fix this case.
  Also many debug message is added to log the error if met.

Signed-off-by: Wenchao Xia <a82bded1b492a49d76e42d0788520e04e9fbf126@linux.vnet.ibm.com>

libvirt/libvirt-cim,libvirt/libvirt-cim,libvirt/libvirt-cim