server: Setting snapshot removed on timeout (#4425)

* Setting snapshot state to error on timeout

* Setting removed field so snapshot record is ignored by garbage collection

* Removed explicitly setting error status, renamed method from markFailed to markRemoved

* Renamed method, moved code a few lines down

* Moved remove logic

* Removed unused service

* Moved removed logic - last time, promise

Author: Spaceman1984

engine/storage/snapshot/src/main/java/org/apache/cloudstack/storage/snapshot/SnapshotServiceImpl.java

@@ -323,6 +323,7 @@ protected Void copySnapshotAsyncCallback(AsyncCallbackDispatcher<SnapshotService
         if (result.isFailed()) {
             try {
                 if (createSnapshotPayload.getAsyncBackup()) {
+                    _snapshotDao.remove(srcSnapshot.getId());
                     destSnapshot.processEvent(Event.OperationFailed);
                     throw new SnapshotBackupException("Failed in creating backup of snapshot with ID "+srcSnapshot.getId());
                 } else {