* Move getNodeIP logic to utils package
Remove redundant ipset lookups
utils.NewIPSet() does this for us.
* Don't masquerade pod -> nodeAddrsIPSet traffic
Previously with Pod egress enabled, this would get masqueraded.
This change also adds cleanup for said ipset.
* Enhanced cleanup of Pod egress, overlay networking
- Delete old/bad pod egress iptables rule(s) from old versions
- When pod egress or overlay are disabled, cleanup as needed
* Update IPSet.Sets to map type
* ipset enhancements
- Avoid providing method that would delete all ipset sets on a system
- New method DestroyAllWithin() destroys sets tracked by an IPSet
- Create() now handles cases where Sets/System state are not in sync
- Refresh() now handles leftover -temp set gracefully
- Swap() now uses ipset swap
- Delete() improved sync of Sets and system state
- Get() now validates if map element exists before trying
- etc
* Update routes controller to reflect ipset changes
