Fix load command trigger cache block fail in container env

### What changes are proposed in this pull request?

```Console
$ /opt/alluxio/bin/alluxio fs load /ceph/mbl/testa12.txt
Failed to complete cache request for block 150994944 of file
/ceph/mbl/testa12.txt: io.grpc.StatusRuntimeException: UNKNOWN:
java.io.IOException: Failed to connect to remote block worker:
GrpcServerAddress{HostName=XXX,
SocketAddress=XXX/YYY:29999}/ceph/mbl/testa12.txt loaded
```

### Why are the changes needed?

It is a bug.

### Does this PR introduce any user facing changes?

No

pr-link: #14272
change-id: cid-5b719989ad7af10c019fdc0d0037a11ac2dbe028

shell/src/main/java/alluxio/cli/fs/command/LoadCommand.java

@@ -168,15 +168,21 @@ private void cacheBlock(long blockId, WorkerNetAddress dataSource, boolean local
       URIStatus status, Protocol.OpenUfsBlockOptions options) {
     BlockInfo info = status.getBlockInfo(blockId);
     long blockLength = info.getLength();
+    String host = dataSource.getHost();
+    // issues#11172: If the worker is in a container, use the container hostname
+    // to establish the connection.
+    if (!dataSource.getContainerHost().equals("")) {
+      host = dataSource.getContainerHost();
+    }
     CacheRequest request = CacheRequest.newBuilder().setBlockId(blockId).setLength(blockLength)
-        .setOpenUfsBlockOptions(options).setSourceHost(dataSource.getHost())
+        .setOpenUfsBlockOptions(options).setSourceHost(host)
         .setSourcePort(dataSource.getDataPort()).build();
     try (CloseableResource<BlockWorkerClient> blockWorker =
         mFsContext.acquireBlockWorkerClient(dataSource)) {
       blockWorker.get().cache(request);
     } catch (Exception e) {
       System.out.printf("Failed to complete cache request for block %d of file %s: %s", blockId,
-          status.getPath(), e.toString());
+          status.getPath(), e);
     }
   }
 }