Zabbix

A......... [ZBX-20859] fixed incorrectly exported host groups in map elements

* commit '8ab28dcf078f9530b56f38e412fc49c05a5edc52':
  A......... [ZBX-20859] fixed import of the graphs with ymin_type_1 and ymax_type_2 fields with default value
  A......... [ZBX-20859] fixed PHPDoc issues
  A......... [ZBX-20859] fixed coding style
  A......... [ZBX-20859] fixed incorrectly exported host groups in map elements
  A......... [ZBX-20859] removed unused "export" directives from old validation rules