Zabbix

A......... [ZBXNEXT-6528,ZBXNEXT-6565] improved performance of host.create and template.create methods; improved performance of templates linking process; optimized DB::insert() method to send bulk SQL inserts

* commit '806525303ad9e6fae0d00645968bd23a0e23c5b3':
  A......... [ZBXNEXT-6528,ZBXNEXT-6565] fixed code style; removed unused function
  A......... [ZBXNEXT-6528,ZBXNEXT-6565] improved performance of host.create and template.create methods; improved performance of templates linking process; optimized DB::insert() method to send bulk SQL inserts