config: factor out method to get the absolute datastore path

removable datastores will have a PBS-managed mountpoint as path, direct
access to the field needs to be replaced with a helper that can account
for this.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>

pbs-api-types/src/datastore.rs

@@ -357,6 +357,11 @@ impl DataStoreConfig {
         }
     }
 
+    /// Returns the absolute path to the datastore content.
+    pub fn absolute_path(&self) -> String {
+        self.path.clone()
+    }
+
     pub fn get_maintenance_mode(&self) -> Option<MaintenanceMode> {
         self.maintenance_mode.as_ref().and_then(|str| {
             MaintenanceMode::deserialize(proxmox_schema::de::SchemaDeserializer::new(