This new option for slapos.cfg allow to define a list of paths to use
for shared parts feature of `slapos.recipe.cmmi`.
This will be injected in the buildout profile used to install software,
as `${buildout:shared-part-list}` which is the option `slapos.recipe.cmmi`
use since 0.11.

Note that the option changed in `slapos.recipe.cmmi` because this was
incompatible. In 0.10, the option was named `${buildout:shared-parts}` and
it was supposed to be a single path. `slapos.recipe.cmmi` 0.10 was trying
to create this path. If we continued using this `${buildout:shared-parts}`
option and changed to passe a newline-separated list of paths, then
`slapos.recipe.cmmi` would just create one directory with \n in the name
and will probably fail, which would make all software from 1.0.73 to 1.0.121
not installable on next `slapos.core`, so we used another buildout option
to prevent this problem.

Because generally, profiles using slapos.recipe.cmmi 0.10 were not
"safely" shared, we don't even provide compatibility with old option.

/reviewed-on !46

This is about replacing the `utils.py` we have duplicated in each software release tests by a more "official API".

This introduce a  "sandalone slapos API" which are helpers around slapos API to create a recursive SlapOS. This can eventually replace implementation of erp5testnode and slaprunner (but there are no plans for that)

/reviewed-on !64

connection_dict generated by client can be different in details from the
server side, so pass it thorugh a way how it is treat on the server.

Also, as we are going to be compatible with py3, calculate hash from
sorted items of a dict, instead of relying on side effect of py2 "ordered dict"

https://portingguide.readthedocs.io/en/latest/dicts.html#changed-key-order

Test are focused on client side, and the tricky cases are covered, they
somehow contain the protocol of client <--> server comparision.

All tools from the ecosystem shall use the same way to convert between python's
dict and XML.

Additionally stabilise generated XMLs by sorting the dictionary.

A set of utility classes to run a local slapos computer and control
softwares/instances on this computer

Calling computer.updateConfiguration should remove previously defined
partitions that are no longer part of the configuration.

Similar to the way we bypass for simple frontends. This should allow kvm
software promises to pass.

When slapproxy is not using multi-master, shared frontend requests
were never fulfilled. This is problematic because several promises (for
example monitor ones) assert that frontend is instanciated and properly
responding to HTTP requests.
Better-than-nothing approach is to return the URL provided as input,
ie: "Give me a frontend for $URL" -> "OK, just use $URL".

(because it looks strange)

This reverts commit 042bd6bc.

This reverts commit fca2f842.

This reverts commit 7698537e.

This reverts commit 974c3763.

This reverts commit f629cf50.

This reverts commit 7c040914.

BTW, Chinese currency official abbreviation is CNY. Maybe I should
submit the currency_module/CNY to nexedi/erp5 repository

test.erp5.testSlapOSSubscriptionSkins

test.erp5.testSlapOSSubscriptionSkins

We can create reversal sale invoice transactions as payments to release allocation the allocation of subscription related instances.

Because it's sometimes hard to find out in the full output of slapos
node instance which partition failed, report a more concise summary at
the end.

/reviewed-on nexedi/slapos.core!134

Add the corresponding test.