Wrap IPv6 addresses in udp6:[<addr>] for check_snmp

refs #8259

itl/command-plugins.conf

@@ -718,7 +718,6 @@ object CheckCommand "load" {
 
 object CheckCommand "snmp" {
 	import "plugin-check-command"
-	import "ipv4-or-ipv6"
 
 	command = [ PluginDir + "/check_snmp" ]
 
@@ -740,7 +739,17 @@ object CheckCommand "snmp" {
 		}
 	}
 
-	vars.snmp_address = "$check_address$"
+	vars.snmp_address = {{
+		var addr_v4 = macro("$address$")
+		var addr_v6 = macro("$address6$")
+
+		if (addr_v4) {
+			return addr_v4
+		} else {
+			return "udp6:[" + addr_v6 + "]"
+		}
+	}}
+
 	vars.snmp_community = "public"
 	vars.snmp_invert_search = false
 	vars.snmp_timeout = "10"