Fix exporters deployment error

On compute nodes we get:
cmp01.virtual-mcp11-contrail.local:
----------
          ID: libvirt_exporter_service
    Function: service.running
        Name: libvirt-exporter
      Result: False
     Comment: The following requisites were not found:
                                 watch:
                                     file: libvirt_exporter_service_config_file

Change-Id: I31069ec37702f8466da27b76c0becc6802cea272
1 file changed