They have integrated unix domain support

* use more recent shellinabox with copy & paste support
* URL is now /shellinabox/ for some reason. Runner template has to be updated
* PATH now contains /bin/ & /usr/bin/ is it good ?
* Fixes for account creation when no .htpassword
* Fixes for incorrect $HOME on shellinabox

Also move mariadb buildout instance profile to dynamic template.

{{- parameters.project_public_folder -}} prevents newline.

Let the supervisord of slaprunner managing the instance processes
be managed by supervisord of slapos node.

Fixes problems of process like supervisord escaping control.

Also remove unused variable in nginx-conf.

Also unpin slapos.Cookbook.
Related problem with Jinja2.7 has been fixed in slapos.recipe.template 2.5.

Informations about what failed and what succeeded.