add test to check that requesting a Slave Instance twice with same arguments from different Computer Partition will return same object.

change workflow interaction to destroy the Slave Instance when is requested to destroy the Software Instance related.

Conflicts:

	master/bt5/vifib_slap/bt/revision

issues

This avoid renamed instances in transitionnal state to be runned by
slapgrid-cp.

This avoid the software instance to be updated by bang().

This avoid other tests doing Tic to fail.

The update of sale packing list during the title changing was removed in
3cd96faf because it was not needed.

software_instance_tree table.

The new root of the tree isn't root_software_instance anymore
but hosting_subscription.

Modify HostingSubscription_requestRootSoftwareInstance in order to avoid starting/stopping a destroyed computer partition.

Modify HostingSubscription_requestRootSoftwareInstance in order to pass testVifibSlapBang.test_computer_bang_not_called_on_partly_destroyed_tree

It is not allowed to access to collections.deque in a python script.
Let switch back to poor man queue using python native lists.

This reverts commit 18060ee5.

Conflicts:

	master/bt5/vifib_base/bt/revision

Check connection from root hosting subscription instead of root software instance in SoftwareInstance_requestSoftwareInstance