adapted from PBS. Main differences are:
* API has GET/DELETE distinction instead of 'dry-run'
* API expects a single property string for the prune options
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Commit 2dcc87c798 removed the statefulness from
the other storage content views, so remove it from the remaining ones too.
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>