This commit add a new CLI
``nova volume-update [--[no-]delete-on-termination]
<server> <src_volume> <dest_volume>`` to update
'delete_on_termination' for an attached volume, that the user can
decide whether to delete attached volumes when destroying the server.
Depends-On: https://review.opendev.org/#/c/711194/
Change-Id: I1fc64fb6e6611c92c6b72265e1bf4b32e9c45f0a
Blueprint: destroy-instance-with-datavolume