Ansible-improvements for better image-creation

[orgua]

Ansible

• cleaning-role
  • keep shepherd/.git dir
  • remove more packages
  • speed up package-removal
• harden_fs - remove new swap, improve root-detection
• maintenance-role - integrate harden_fs
• observer-role - allow adding datastorage without connection
• general speedup by using new config-options (fact caching, skipping compression, keeping ssh-connections)