The way a delete works, it was always trying to stop the sandbox, even
when the force flag was not enabled. Because we want to be able to stop
the sandbox from a kill command, this means a sandbox stop might be
called twice, and we don't want the second stop to fail, leading to the
failure of the delete command.
That's why this commit checks for the sandbox status before to try
stopping the sandbox.
Fixes#246
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
163a081776