EXPORTD: (metadata server)
a)inode:
      change the way the name of the object is stored in the inode
      add fields for user and group goup (other than uid and gid)
      add a reserved field dedicated to HPC
      add suffix fields dedicated to inode indexation feature

b) inode tracking:
       add the trk_bitmap file to tracking inode file changes
       this feature is dedicated to inode indexation

c) dirent:
       improve the writeback cache
       add a dynamic hash function that takes care of the number of
       file within the parent directory. The goal is to avoid
       creating large dirent file number when the number of
       file is quite low. There are 3 levels of hash.
       This will improve the readdir/mknod/mkdir/rmdir and unlink
       processing time as it optimizes the disk accesses.

d) quota management:
       introduction of user and group quota accounting without
       any quota enforcement.

e) filesystem stats:
       add a writeback thread for file/blocks update on disk

f) create/delete file group:
       add a feature for creating a bunch of file. filename format:
          .@rozofs-mf@<count><-><basename>

g) exportd reload: avoid to restart the slave exportd

DISK TABLE SERVICE:
  new service that provides disk table read/write on the same model as inodes.
ROZOFSMOUNT:
a) ientry cache
     change the hash function and add statistics on hash table

b) rmdir/unlink:
      send a direct reply to caller do the transaction
       with the exportd in background: the service can
       be asynchronous since there is always a lookup before
       VFS calls either rmdir or unlink.
c) fuse :
       change the priority of rozofs_fuse in socket controller (3 -> 16)
STORIO:
   compilation warning