Add sharetab to joyent zones

@@ -49,10 +49,11 @@
             opt="ro,nodevices" type="lofs" />
         <global_mount special="%R/local" directory="/usr/local"
             opt="nodevices" type="lofs" />
         <global_mount special="%R/ccs" directory="/usr/ccs"
             opt="nodevices" type="lofs" />
+        <mount special="sharefs" directory="/etc/dfs/sharetab" type="sharefs" />
 
         <!-- Local filesystems to mount when booting the zone -->
         <mount special="/proc" directory="/proc" type="proc" />
         <mount special="ctfs" directory="/system/contract" type="ctfs" />
         <mount special="mnttab" directory="/etc/mnttab" type="mntfs" />