....I..... [ZBXNEXT-826] added empty database upgrade module for version 2.5.0

git-svn-id: svn://svn.zabbix.com/trunk@48984 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2
..F....... [ZBX-8700] fixed ChangeLog

git-svn-id: svn://svn.zabbix.com/trunk@48985 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2