ldap_createsuperuser: Use input() for asking username

This should improve Python3 compatibility
5 jobs for master in 11 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #33152
py27_django110

00:00:10

passed #33153
py27_django111

00:00:10

passed #33150
py27_django18

00:00:10

passed #33151
py27_django19

00:00:10

failed #33154
py34_django111

00:00:00

 
Name Stage Failure
failed
py34_django111 Test There is an unknown failure, please try again
Using Shell executor...
Running on bild.hrz.tu-chemnitz.de...
Cloning repository...
Klone nach '/var/gitlab-runner/builds/5a848846/4/urz-django/fountain'...
Checking out b7b75d69 as master...
Skipping Git submodules setup
$ virtualenv-3.4 ./py34_django111
bash: Zeile 50: virtualenv-3.4: Kommando nicht gefunden.
ERROR: Job failed: exit status 1