RSM

.......... [RSM-1] merge from upstream (master), resolve issues related to removing item rsm.dns.nssok and other conflicts

Conflicts:
	automated-tests/test-cases/sla-api/001-all-services-disabled.txt
	automated-tests/test-cases/sla-api/002-all-services-enabled-all-up.txt
	automated-tests/test-cases/sla-api/004-all-services-enabled-all-up-inconclusive.txt
	src/tests/t_rsm_dns.c
	src/zabbix_server/poller/checks_simple_rsm.c
	ui/modules/RSM/functions.inc.php