Extract get-pip change in a separate commit
cc @jm @romain

/reviewed-on nexedi/slapos!621

Using WSGI became the default behavior in
f4d141a1.

--user=root is redundant and it will break with MariaDB 10.4

This is important for performance and it enables testless promises.

For partitions that are instantiated successfully, let slapos decide
when there's no parameter change (usually once a day).

Instantiation can be forced on manual action in the UI.

Remove method `generateHashFromFiles` in all file `test.py`, import it from `slapos.recipe.librecipe`.

/reviewed-on nexedi/slapos!617

/reviewed-on nexedi/slapos!611

This turnserver work on IPv6 but to allow communication with all devices, external-ip parameter is used to set public IPv4 which will be used by client.

/reviewed-on nexedi/slapos!610