[rucksack] first part of refactor
[rucksack seperated tiedot db from rucksackapp]
[rucksack] add todo method createDefaultAdminUser
[picnic] moved getTlsConfig into helpers, add InitUsers
[rucksack] separated db from rucksack app.
Merge branch 'rucksackRefactor'

* rucksackRefactor:
  [rucksack] separated db from rucksack app.
  [picnic] moved getTlsConfig into helpers, add InitUsers
  [rucksack] add todo method createDefaultAdminUser
  [rucksack seperated tiedot db from rucksackapp]
  [rucksack] first part of refactor