There is a major problem with memory consumption, probably a leak,
when the role is included.
If it is played in the playbook, the whole run takes ~200 MB.
If it is played as an included role, the run takes 2.4GB.
* rename admin-users to evolinux-users
* splitting the "sudo" part for users between jessie and stretch
* with stretch, the sudo group is customizable and properly configured
* import evolinux-users role from evolinux-base at proper time
to ensure ssh connections are possible for other users before
cutting root's access
* evomaintenance is also included in evolinux-base to have it available
when users are created