Zabbix

...G...... [ZBXNEXT-2943] added possibility to run active agent checks from multiple Zabbix hosts

Merge in ZBX/zabbix from feature/ZBXNEXT-2943-5.1 to master

* commit '2f85d3f57adfae61fd64b025a6266ff6a490b676': (31 commits)
  ...G...... [ZBXNEXT-2943] corrected usage of err variable
  ...G...... [ZBXNEXT-2943] removed empty line
  ...G...... [ZBXNEXT-2943] add empty line
  ...G...... [ZBXNEXT-2943] fixed test option 2
  ...G...... [ZBXNEXT-2943] fixed test option
  ...G...... [ZBXNEXT-6191] fixed error message
  ...G...... [ZBXNEXT-6191] harmonisation of agent and agent 2 conf files
  ...G...... [ZBXNEXT-6191] fixed memory leak of str vector
  ...G...... [ZBXNEXT-6191] reduced scope of first_hostname only for windows
  ...G...... [ZBXNEXT-6191] refactored hostname parsing
  ...G...... [ZBXNEXT-2943] minor change
  ...G...... [ZBXNEXT-2943] fixed typo in error message
  ...G...... [ZBXNEXT-2943] fixed Windows service name
  ...G...... [ZBXNEXT-2943] fixed tab in multiple hostnames
  ...G...... [ZBXNEXT-2943] corrected according to comments from PR
  ...G...... [ZBXNEXT-2943] first Hostname is used as Windows service name
  ...G...... [ZBXNEXT-2943] fixed empty hostname and changelog
  ...G...... [ZBXNEXT-6191] fixed truncation of hostnames
  ...G...... [ZBXNEXT-2943] edited config files
  ...G...... [ZBXNEXT-2943] updated host names length
  ...