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).

A list of authorized ip can also be send

firewall process is now controlled by supervisord

slapos firewall: speed up computer_partitions configuration

slapos firewall: block etablished and related connection which are not allowed

i.e no single line of code in this entire repository can start supervisord implicitely if option is set.
In such case, the only way to start supervisord is to run slapos node supervisord explicitely.

Also move and simplify management of configuration files.

Instead, poll often, and continue if promise finished.

 In relation to data collection this commit introduces:

  - data collector for temperature (parsing sensors)
  - Heating testing for determinate the Zero Emission Ratio of the computer.

 In relation to reports this commits introduces:

  - Consumption report for computer usage (CPU Load, Zero Emission Ratio, Memory)
  - Consumption report for partitions (CPU Load and Memory)
  - All consumption reports uses TioSafe XML Format

slapos.grid: Adapt retention_delay implementation to support retention_delay being specified in SLA.

Mostly informational, it is more improtant to have a functional slapgrid.
Also: remove trailing spaces.

Major changes
  Rename pymonitor, add dependency and simplify
  Save all information using sqllite
  Record information from all processes individually
  Implement Snapshot for Computer and Systems information
  General Clean up

slapos.grid: Adapt retention_delay implementation to support retention_delay being specified in SLA.

Mostly informational, it is more improtant to have a functional slapgrid.
Also: remove trailing spaces.

Major changes
  Rename pymonitor, add dependency and simplify
  Save all information using sqllite
  Record information from all processes individually
  Implement Snapshot for Computer and Systems information
  General Clean up