added the worker skeleton for snapshot creation
refactoring of network and message packages
added the reference to mrs channel into snapshot job and a little refactoring
for method, of the network broker, for retrieve the metadata server channel
Finalized the sna[pshot save function and added to db driver the abstraction to achieve that operation

- new utility for snapshot has been added
- the ui toolkit is being modified to let user to use the system api channel
add api to uitoolkit for snapshot
The snapshot creation has been done
- a new utility ChaosSnapshotUtility as been created (now permit only to create a snapshot on all or a subset of producer id)
Merge pull request #10 in CHAOS/chaosframework from feature/CHSFRMWRK-73-snapshoot-creation to development

* commit 'b5612e4f272be88e99fd65d4e1655290c512ca89':
  The snapshot creation has been done - a new utility ChaosSnapshotUtility as been created (now permit only to create a snapshot on all or a subset of producer id)
  add api to uitoolkit for snapshot
  Finalized the sna[pshot save function and added to db driver the abstraction to achieve that operation
  added the reference to mrs channel into snapshot job and a little refactoring for method, of the network broker, for retrieve the metadata server channel
  refactoring of network and message packages
  added the worker skeleton for snapshot creation