Package eterban: Information

- eterban_switcher.py: return error on redis connection error
- add auto-unban with exponential backoff
- spec: use phpphp_defver macro instead of hardcoded php8.1

- switch to php8.1-redis (ALT bug 46925)
- eterban: improve count output
- eterban: add clear command

- add i_interface2 support
- index.html: update text
- add IPv6 support
- eterban.service: add Restart=always
- eterban.service: add After:
- eterban.spec: add post/preun service section