Remove StorageManager::Hybrid and StorageManager::Match. These were used
to store uploads on different servers based on the post ID or file
sample type. This is no longer used in production because in hindsight
it's a lot more difficult to manage uploads when they're fragmented
across different servers.
If you need this, you can do tricks with network filesystems to get the
same effect. For example, if you want to store some files on server A
and others on server B, then mount servers A and B as network
filesystems (with e.g. sshfs, Samba, NFS, etc), and use symlinks to
point subdirectories at either server A or B.
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