[linux-cifs-client] xattr handlers

[Steve French]

I plan to switch the cifs vfs code to use the new "generic_xattr" 
handler approach (where the handlers for each namespace are set up as 
different functions rather than parsing for all xattr types in one big 
cifs_getxattr function).  This is the approach that ext3 and xfs have 
switched to already.  This will mean that the cifs ACL code will be in a 
different function.