There is no need to commit this messages.

Switch to Web UI to make simple actions is inconvient, so this commit moves the scripts to ERP5 UI to share the feature over the 2 UIs.

Buildout cannot request destroy sub instances when it is removed from
instance parameters by the user. Ex: request a cluster of KVM, with
kvm1 and kvm2 instances, edit parameters and remove kvm2 in the list.
Buildout will just ignore that instance and it will be removed only when
the hosting subscription will be destroyed.

                 -- kvm1
root instance --|
                 -X- kvm2

So when processing a partition, we send to master the list of requested sub
instance(s). If the previous list was ['kvm1', 'kvm2'], then after remove kvm2
the list will be ['kvm1'] (for the root instance). Commit this list to the
master will unlink between root instance and kvm2 (predecessor categorie).

A new alarm will search for unlinked instances: Instance which has no parent,
and destroy them (also destroy the sub tree).

  Public IPv4, slapos_version, python_version and os_type (includes kernel information)

This allow master to check for updated computers.

slapos_monitoring: create jio_storage only once for each storage and update when configuration change