Zabbix

A......... [ZBX-19536] fixed host.get with selectTags = ['tag'] call attempting to retrieve tag value as well

* commit '517da9f9679e17b0ecd3e9477c7e05691ad458c3':
  A......... [ZBX-19536] changed selectTags tests
  A......... [ZBX-19536] fixed host.get:selectTags tests
  A......... [ZBX-19536] removed out of scope tag validation, simplified tag collection
  A......... [ZBX-19536] fixed host.get:selectTags accessing tag's "value" field when not asked, not validating input; added tests