Remove clone_disk flag on VxVM

When VxVM devices are shown as clone disk, below command allows the flag to be cleared.
Refer to http://www.symantec.com/business/support/index?page=content&id=TECH70049 for more detail.

 # vxdisk list
DEVICE       TYPE            DISK         GROUP        STATUS
emcpoweraa   auto:cdsdisk    emcpowerq    vmax_vcsdg   online clone_disk
emcpowerab   auto:cdsdisk    emcpowerp    vmax_vcsdg   online clone_disk

# for i in `vxdisk list |grep clone_disk | awk '{print $1}'`; do echo $i; vxdisk set $i clone=off; done

# vxdisk list
DEVICE       TYPE            DISK         GROUP        STATUS
emcpoweraa   auto:cdsdisk    emcpowerq    vmax_vcsdg   online
emcpowerab   auto:cdsdisk    emcpowerp    vmax_vcsdg   online