Merge branch 'hotfix/1.5.2'
Fixed bug: do not alloc ientry for a directory entry in readdir
function.
Fixed bug in ientry htable.
Invalidate ientry when we set RozoFS xattr.
Increase the nb. of disk threads max from 16 to 32.
Increase the number of RPC decoding context from 8 to 32.
Fixed bug for "rozo storage add" command [rozo].
Fixed bug for "rozo storage remove" command [rozo].
Change version to 1.5.3.
Fixed compilation warning in rozofs_readdir file.
rozodiag diskthread command display on several lines
Help distribution of files upon clusters on a bursty creation
The real free size of storages and clusters is computed every 8 seconds.
At that time the clusters of a volume are put in a list ordered by the
most free disk space left. Then each time a file is created the free
size of the cluster is reduced of 256K and the clusters are re-oredered
if necesary.
Change rozodiag "xattr_disable" command to "xattr disable"
When running rozodiag -c all,  xattr_disable disable extended attributes
while xattr just displays a help message
Fix compilation warning
Add "counters reset" rozodiag command
This command calls every command that is declared as resettable. That is
command which can be called with reset parameter to reset some counters.
Fix issue #83 Meta-data server crash after unlink() rejection with No such file error
Merge branch 'hotfix/1.5.3' into develop

Conflicts:
	CMakeLists.txt
	debian/changelog
	manager/rozofs/__init__.py
	rozofs/core/rozofs_rpc_non_blocking_generic_srv.h
	rozofs/core/uma_dbg.c
	rozofs/core/uma_dbg_api.h
	src/rozodiag/rozodiag.c
	src/rozofsmount/rozofsmount.c
	src/storaged/storio_disk_thread_intf.c