Allow forceDelete to delete running instances

[OpenStack Infra]

https://review.openstack.org/111157
commit eb19c346b5fd8c2cb10f50a32f689e88a6a79d92
Author: Chris Yeoh <email address hidden>
Date: Fri Aug 1 14:14:55 2014 +0930

    Allow forceDelete to delete running instances

    Currently attempting to force delete a running instance
    fails while a normal delete can succeed. This changes the
    behaviour of force_delete so any instance can be deleted
    and not just ones which have already been soft deleted.

    Also catch InstanceIsLocked exceptions at the API layer
    and now also don't need to catch InstanceInvalidState
    exceptions since they are no longer raised

    DocImpact: forceDelete will now delete any instance and not
      just ones which have already been soft deleted

    Change-Id: I06a476701ccb47d8f7fd6e43c394ccb3fac2b3aa
    Closes-Bug: 1351001

[Tom Fifield (fifieldt)]

This is a welcome change in behaviour, and as such not a doc bug