verify: factor out common parameters

all the verify methods pass along the following:
- task worker
- datastore
- corrupt and verified chunks

might as well pull that out into a common type, with the added bonus of
now having a single point for construction instead of copying the
default capacaties in three different modules..

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/server/verify_job.rs

@@ -67,7 +67,8 @@ pub fn do_verification_job(
                 task_log!(worker,"task triggered by schedule '{}'", event_str);
             }
 
-            let result = verify_all_backups(datastore, worker.clone(), worker.upid(), None, Some(&filter));
+            let verify_worker = crate::backup::VerifyWorker::new(worker.clone(), datastore);
+            let result = verify_all_backups(&verify_worker, worker.upid(), None, Some(&filter));
             let job_result = match result {
                 Ok(ref failed_dirs) if failed_dirs.is_empty() => Ok(()),
                 Ok(ref failed_dirs) => {