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make iptables wait flag generic and tune it to 5 seconds

Excerpt from [bug](https://bugzilla.redhat.com/show_bug.cgi?id=1506396) opened by @eparis 

> iptables-restore has a 2s wait timeout. Data collected today shows that even with a much faster kernel we can reasonably expect iptables-restore to take upwards of 2.4 seconds. (with unpatched/released RHEL kernel this can easily take 7-8 second)

> longest runs I saw over about 30 minutes were:
> 2.267244
> 2.284707
> 2.291535
> 2.376457

> If we get 2 iptables restores going at the same time, with a 2s timeout it is very likely the second will fail.

> I'd like to suggest a 5s timeout. It should still bound the number of thread we may be waiting on and increases the reliability that a common situation will be automatically resolved without failing up the stack.