Fix check_snmp test on solaris

plugins/t/check_snmp.t

@@ -94,7 +94,7 @@ SKIP: {
 		skip "no non invalid host defined", 2 if ( ! $hostname_invalid );
 		$res = NPTest->testCmd( "./check_snmp -H $hostname_invalid   -C $snmp_community -o system.sysUpTime.0 -w 1: -c 1:");
 		cmp_ok( $res->return_code, '==', 3, "Exit UNKNOWN with non responsive host" ); 
-		like($res->output, '/External command error: .*(nosuchhost|Name or service not known)/', "String matches invalid host");
+		like($res->output, '/External command error: .*(nosuchhost|Name or service not known|Unknown host)/', "String matches invalid host");
 	}
 
 }