Add a standalone method to build / remove a specified
list of softwares, using slapos node software --only.

See merge request nexedi/slapos.core!589

have them deleted afterwards.

e2e.py, used for slapos/software/end-to-end-testing, can be given to a
testnode to run end-to-end-tests by requesting real instances.

See merge request nexedi/slapos.core!588

  It seems to define multiple entries leads to multiple attempts to install the all bt5s.

See merge request nexedi/slapos.core!586

  Otherwise printout may fail to print.

   This allow the sites to work w/o payzen or wechat preconfigured.

   Return None rather them raise, to allow the site to show an alternative page or inform that payments are disabled.

   Script was renamed long ago but never used in the end.

   since you cannot re-request on the same transaction after login into a different user.

See merge request nexedi/slapos.core!581

   It raises if it is not properly indexed.

   remove expected failures from tests.

With bd92f809 (slap/hateoas: use new name for portal type
("Compute Node" instead of "Computer"), 2023-11-30) the API changed.

See merge request nexedi/slapos.core!580

   Use a gadget_erp5_page_json_editor rather them gadget_erp5_page_slap_json_form
   Update tests to follow up changes for the new json-editor

    and don't exclude/add successor if nothing changed

See merge request nexedi/slapos.core!585

See merge request nexedi/slapos.core!584

Prevent netifaces from introducing netmasks in the form of 'ffff::/16'.
Once this has been applied everywhere, all other fixes for this can be
dropped.

Currently computer netmask looks like 'ffff::/16' in slapos.xml.
With this commit, this netmask will be cleaned up to just 'ffff::'.

Computer definition file (slapformat-configuration.cfg) may now have:

```
[partition_0]
...
capability_list =
  fast-network
  more_disk_space
  yet another capability

...
```

Capabilities are line-separated and may otherwise contain whitespace.
Whitespace at the beginning and end of each line is stripped.