Zabbix

..F....... [DEV-3225] fixed CEncryptedCookieSession data initialization for broken signature

Merge in ZBX/zabbix from feature/DEV-3225-6.0 to release/6.0

* commit '48e7615d1e1e3a5f543505cc6cb0a5564a655b58':
  ..F....... [DEV-3225] added session data signature check to read session data only when signature is valid