Medium: ldirectord: precedence error with perl v5.8.8 in IPv6 code

Details of this issue is described in this fix:
https://github.com/ClusterLabs/resource-agents/commit/829aed7b962e1e90f4f5e43b03373e9aa93d4032

This commit fixes a similar code which was introduced after the fix above:
https://github.com/ClusterLabs/resource-agents/commit/d8f6c5d8cab26df8cbc99830c62e8f97ec653a1c

Thanks to yosuke takadate.