When a CLI user specifies --os-volume api-version 3.66, the shell
will execute the appropriate shell code, but if the server only
supports < 3.66, the client is automatically downgraded and correctly
uses the pre-3.66 SnapshotManager.create() method.
In that case, the 'force' parameter, which is technically not allowed
in mv 3.66 (but which silently accepts a True value for backward
compatibility), will have a value of None, which the pre-3.66 code
happily passes to cinder as '"force": null' in the request body, and
which then fails the Block Storage API request-schema check.
Handle this situation by detecting a None 'force' value and setting
it to its pre-3.66 default value of False.
Change-Id: I3ad8283c2a9aaac58c8d2b50fa7ac86b617e5dd3
Closes-bug: #1995883
9df653571d