Don't show backup storage in list_capacity for dummy plugin or if backup_framework is disabled

Author: abh1sar

plugins/backup/dummy/src/main/java/org/apache/cloudstack/backup/DummyBackupProvider.java

@@ -191,7 +191,7 @@ public boolean supportsInstanceFromBackup() {
 
     @Override
     public Pair<Long, Long> getBackupStorageStats(Long zoneId) {
-        return new Pair<>(8L * 1024 * 1024 * 1024, 10L * 1024 * 1024 * 1024);
+        return new Pair<>(0L, 0L);
     }
 
     @Override

server/src/main/java/org/apache/cloudstack/backup/BackupManagerImpl.java

@@ -2161,6 +2161,9 @@ public BackupResponse createBackupResponse(Backup backup, Boolean listVmDetails)
 
     @Override
     public CapacityVO getBackupStorageUsedStats(Long zoneId) {
+        if (isDisabled(zoneId)) {
+            return new CapacityVO(null, zoneId, null, null, 0L, 0L, Capacity.CAPACITY_TYPE_BACKUP_STORAGE);
+        }
         final BackupProvider backupProvider = getBackupProvider(zoneId);
         Pair<Long, Long> backupUsage = backupProvider.getBackupStorageStats(zoneId);
         return new CapacityVO(null, zoneId, null, null, backupUsage.first(), backupUsage.second(), Capacity.CAPACITY_TYPE_BACKUP_STORAGE);