Do not ask for group in pre-setup

The group is initially set to the H one, and changed to NH when the
questions require it.
3 jobs for explicit-homomorphism in 16 minutes and 40 seconds
Status Job ID Name Coverage
  Build And Run Automated Test Scenarios With Preinstalled Image
passed #308416
build_and_run_automated_test_scenarios_with_preinstalled_image

00:05:15

 
  Build And Test With Preinstalled Image
passed #308417
build_and_test_with_preinstalled_image

00:01:03

 
  Build And Test With Debian Image
passed #308418
build_and_test_with_debian_image

00:10:20