ceph_filestore_dump: Add get-omap object command

Signed-off-by: David Zafman <david.zafman@inktank.com>
ceph_filestore_dump: Add set-omap object command

Signed-off-by: David Zafman <david.zafman@inktank.com>
ceph_filestore_dump: Add rm-omap object command

Signed-off-by: David Zafman <david.zafman@inktank.com>
ceph_filestore_dump: Add get-omaphdr object command

Signed-off-by: David Zafman <david.zafman@inktank.com>
ceph_filestore_dump: Add set-omaphdr object command

Signed-off-by: David Zafman <david.zafman@inktank.com>