Coveringnetworks

[hiddn]

Addition of the CoveringNetworks() and CoveringOrCoveredNetworks() methods. I'm certainly open to better name choices if you have something better in mind.

This lib is useful to me and I use these additions, especially CoveringOrCoveredNetworks(). I'm happy if they can benefit others too.

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[hiddn]

@yl2chen, after I opened PR #47, I noticed there was another PR with the exact same name (PR #43), which is still open (oups).

Re your comment in PR #47, I did test your code suggestion, but with my own PR, with the following line:
func (p *prefixTrie) CoveringNetworks(network net.IPNet) ([]RangerEntry, error) { return p.ContainingNetworks(network.IP.Mask(network.Mask)) }

My tests failed. In test case TestPrefixTrieCoveringNetworks/path_not_taken, CoveringNetworks("192.168.0.0/16") returns "192.168.0.0/24" but shouldn't.

I'm open to adjustments and to discussion.

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