Merge branch 'cherry-pick-5ed0185f' into 'develop'

Modified unix agent to get properly os on Darwin

See merge request artica/pandorafms!823

pandora_agents/unix/pandora_agent

@@ -1579,6 +1579,9 @@ sub guess_os_version ($) {
 	# AIX
 	} elsif ($os eq 'aix') {
 		$os_version = "$2.$1" if (`uname -rv` =~ /\s*(\d)\s+(\d)\s*/);
+	# Darwin
+	} elsif ($os eq 'darwin') {
+		$os_version = `defaults read loginwindow SystemVersionStampAsString`;
 	# Windows
 	} elsif ($os =~ /win/i) {
 		$os_version = `ver`;