Zabbix

...G...PS. [ZBXNEXT-1263] added an option of checking server certificate issuer and subject
                          in Zabbix proxy and agentd

   - Two new configuration parameters - 'TLSServerCertIssuer' and 'TLSServerCertSubject'
      - are added to Zabbix proxy and agentdJ configuration files.
   - passive proxy can check server certificate issuer and subject when an incoming request
     from server is received.
   - active proxy can check server certificate issuer and subject when making outgoing
     connections to the server.
   - agentd can check server certificate issuer and subject when an incoming request from
     server, proxy or zabbix_get is received.
   - agentd can check server certificate issuer and subject when making outgoing connections
     to the server (or proxy) for getting a list of active checks or sending data.
   - small code formatting change.