As https-only becomes default, tests are adapted in order to follow new
approach, case by case, or the redirect http->https is asserted, or https
access is used instead of http.

This is required for Python 3.7

- move or link instead of copying
- don't set too open permissions

See merge request !747

   This would allow the webrunner invoke it to bootstrap the instance
   rather them create the folders manually.

  Creating this file and updating the slapos.cfg configuration
  is possible to call slapos node format from the partition in the
  same way you would do in a computer.

kvm_controller_raw uses slapos.qemuqmpclient from slapos.toolbox

See the following error without this patch:

slapuser61@COMP-202:~/srv/runner/instance/slappart0$ /srv/slapgrid/slappart61/srv/runner/instance/slappart0/bin/kvm_controller_raw
Traceback (most recent call last):
  File "/srv/slapgrid/slappart61/srv/runner/software/1adf3dca589722a5eeac686fd4870ad0/bin/python-with-eggs", line 76, in <module>
    exec(compile(__file__f.read(), __file__, "exec"))
  File "/srv/slapgrid/slappart61/srv/runner/instance/slappart0/bin/kvm_controller_raw", line 9, in <module>
    from slapos.qemuqmpclient import QemuQMPWrapper, getInitialQemuResourceDict
ImportError: No module named qemuqmpclient

Modify components to make them compatible with `slapos.recipe.cmmi` shared mode.

Most of them were straightforward, except:

 - aspell, where all dictionnaries parts were installed in aspell part. Instead of this, we generate an aspell wrapper for each language. This wrapper runs aspell with environment variables so that it loads dictionnaries from the language.
 - fonts, where all fonts were installed in the same `${buildout:parts-directory}/fonts/` folder and where just installing a font part had the side effect to make this font available to every application. Now each font is installed separately and it becomes applications responsability to generate a fontconfig's fonts.conf and set `FONTCONFIG_FILE` environment variable to load it, as described in https://www.freedesktop.org/software/fontconfig/fontconfig-user.html . A new `template-fonts-conf` section was introduced for this.
 - mariadb, where mroonga plugin write in mariadb's folder. For this, mroonga plugin is installed in another directory along with all original mariadb's plugin (that are copied) and mariadb service is configured to use mroonga's plugin folder instead of the default mariadb's folder.

See merge request !706

Include a slapos command implemented with slapos standalone

See merge request !743