https://github.com/OmarElKhaldi/strawberryhunter/issues/2

- The fault tolerance with multiple servers is now working.
https://github.com/OmarElKhaldi/strawberryhunter/issues/2

- I found a bug in the recovery manager that used to manage only primary
  server. Now it's OK. It is working for the backups as well.
https://github.com/OmarElKhaldi/strawberryhunter/issues/2

- Delete unused comments and classes.