multi storio mode
The multi storio mode can be enabled setting the storio parameter of the
storage.conf file to "multiple". The multiple mode is different in release 1
and 2.

Release 1 : one storio is launched per listening port. This storio takes
care of all the cid/sid described in the configuration file.

Release 2 : one storio is launched per cluster. This storio listens on
every given address in the configuration file on the given port + cluster id.
The debug port of the storio is the base debug port + the cluster id.

With the following configuration file, 3 storio are started:
- storio 1 for cluster 1 listening on 192.168.2.1:41001 & 192.168.3.1:41001
- storio 2 for cluster 2 listening on 192.168.2.1:41002 & 192.168.3.1:41002
- storio 3 for cluster 3 listening on 192.168.2.1:41003 & 192.168.3.1:41003
Their respective diagnostic ports are 51028, 51029 and 51030.

threads = 4;
nbcores = 2;
storio  = "multiple";
listen = (
  {addr = "192.168.2.1"; port = 41000;} ,
  {addr = "192.168.3.1"; port = 41000;}
);
storages = (
  {cid = 1; sid = 1; root ="/home/jean-pierre/rozoClients/mio/tests/storage_c1_h1
"; device-total = 4; device-mapper = 4; device-redundancy = 3;},
  {cid = 2; sid = 1; root ="/home/jean-pierre/rozoClients/mio/tests/storage_c2_h1
"; device-total = 4; device-mapper = 4; device-redundancy = 3;}
  {cid = 3; sid = 1; root ="/home/jean-pierre/rozoClients/mio/tests/storage_c3_h1
"; device-total = 4; device-mapper = 4; device-redundancy = 3;}
);
Merge branch 'feature/mdevice' of https://github.com/rozofs/rozofs into feature/mdevice