Zabbix

...G...... [ZBX-20442] fixed ceph plugin not returning percent_used in Zabbix agent 2

* commit 'a12ec3ef630ca26d4a6ffb7e668c979970f3ff4d':
  ...G...... [ZBX-20442] fix changelog
  ...G...... [ZBX-20442] improved changelog, improved ceph test code style
  ...G...... [ZBX-20442] add changelog
  ...G...... [ZBX-20442] fixed ceph plugin not returning percent_used

(cherry picked from commit b5e2cd5c3262ac0018977d4b9c54706bfd09a5d6)