ceph: fix offline volume migration between ceph pools

Author: weizhouapache

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java

@@ -1689,7 +1689,11 @@ to support snapshots(backuped) as qcow2 files. */
              */
             srcFile = new QemuImgFile(KVMPhysicalDisk.RBDStringBuilder(srcPool, sourcePath));
             srcFile.setFormat(sourceFormat);
-            destFile = new QemuImgFile(destPath);
+            if (destPool.getType() == StoragePoolType.RBD) {
+                destFile = new QemuImgFile(KVMPhysicalDisk.RBDStringBuilder(destPool, destPath));
+            } else {
+                destFile = new QemuImgFile(destPath);
+            }
             destFile.setFormat(destFormat);
 
             try {