Add option for dry-run execution

Registered by Fabrizio Vanni

Currently there's no possibility to run freeezer in dry-run mode.
A possible solution is to add a command line option such as:

  --dry-run

When used, freezer should to everything except actually write/delete any objects or any file on the filesystem.
The log messages should also inform about the "dry-run" execution mode

Blueprint information

Status:
Complete
Approver:
Fausto Marzi
Priority:
Low
Drafter:
Fabrizio Vanni
Direction:
Approved
Assignee:
Fabrizio Vanni
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Fabrizio Fresco
Completed by
Fabrizio Vanni

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Gerrit topic: https://review.openstack.org/#q,topic:bp/dry-run,n,z

Addressed by: https://review.openstack.org/159810
    Add dry-run execution

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