Zabbix

.........T [ZBXNEXT-6754] added template Website certificate by Zabbix agent 2

Merge in ZBX/zabbix from feature/ZBXNEXT-6754-5.0 to release/5.0

* commit 'cf15cc12cc69b285fe17447a6a18bff2236c8c59':
  .........T [ZBXNEXT-6754] changed description for "Fingerprint has changed" trigger
  .........T [ZBXNEXT-6754] changed keys to cert.serial_number and cert.sha1_fingerprint
  .........T [ZBXNEXT-6754] fixed syntax mistakes
  .........T [ZBXNEXT-6754] Readme edited
  .........T [ZBXNEXT-6754] changed type of cert.message item to Text, fixed a trigger expression for cert.validation
  .........T [ZBXNEXT-6754] added template Website certificate by Zabbix agent 2