Add an ID to temporary volume snapshot object

The create_cloned_volum method creates a temp snapshot and
when it's done it uses the standard snapshot_delete method
in the LVM driver.

A change was added that logs a statement using the object[id],
but we weren't actually setting this on our temp object so we
would get a trace fo key DNE.  This change adds an id key to
our temp object.

Fixes bug: 1125457

Change-Id: I4d886f2738a3c394a3a3a6373045669cf6bf8aaf
Merge "Add an ID to temporary volume snapshot object"