cachefiles: Implement culling daemon commands

cachefiles: Implement culling daemon commands

Implement the ability for the userspace daemon to try and cull a file or
directory in the cache.  Two daemon commands are implemented:

 (1) The "inuse" command.  This queries if a file is in use or whether it
     can be deleted.  It checks the S_KERNEL_FILE flag on the inode
     referred to by the specified filename.

 (2) The "cull" command.  This asks for a file or directory to be removed,
     where removal means either unlinking it or moving it to the graveyard
     directory for userspace to dismantle.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com