5166 sendmail package should be replaceable

*** 58,68 ****
              grouping='require_all'
              restart_on='none'
              type='service'>
                  <service_fmri value='svc:/milestone/multi-user:default' />
                  <service_fmri value='svc:/system/fmd:default' />
-                 <service_fmri value='svc:/network/sendmail-client:default' />
          </dependency>
  
          <exec_method
              type='method'
              name='start'
--- 58,67 ----