Ceph

The original change in master removed the filestore_xattr_use_omap variable. I checked current master branch and this variable still doesn't exist. We did not use the superblock to prevent this variable from being set back to false. We simply removed the config and all the code for the false setting of it.

I have a clean cherry-pick of dc0dfb9e01d593afdd430ca776cf4da2c2240a20 on dumpling but haven't pushed it.