Revert "remove duplicated metadata subscription in filer"
Revert "remove duplicated metadata subscription in filer"

This reverts commit 34742be0295998c2105a5ee50e3e77ef2397c403.

Related to https://github.com/chrislusf/seaweedfs/issues/2545

chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs