Thanks to this it's possible to catch issues with firewalld

It's not used by us (controlled by supervisor), and would escape /opt/slapos
anyway.

   This introduce specific worklists

    This is a copy of validation_workflow however with specific audit worklists for SlapOS Master.

    If we use multiple titles, once cache is expired on memcached it creates multiples titles overtime.

   Include worklists for Regularisation requests

   This is part of automated process, so no reason for give write access on those events.

  Sale Packing List is fully automated on SlapOS Master, so Administrator shoudn't edit the packing lists.

   It requires args.

    This allows we calculate Outstanting Amout on subscription process (when user order from website)

   Fix up don't create line if line is found.

  This might help us locate insntances per its parameters.

   If the Slave Instance is root instance, we should allocated exclusivelly on Subscription defined computers/instances

  Adopt price based on Variations rather them on the lines.

   The goal is define pricing based on the Service Individual Variation in order to support multiple reservation fee prices.

   Introduce a CDN case with different reservation fee and monthly fee pricing.

    extend test to diff movement

This reverts commit 05a8e283

See merge request nexedi/slapos.core!286

lsblk OS inspection is the way to have realiable results for querying the
devices on the system, so fully switch to it, while still supporting symlinks.

Disks and partitions are supported.

Context manager is not needed here and even makes more mess, just simply
patch all what is needed in setUp, then unpatch in tearDown.