TrafficMonitor IPV6 improvements

[serDrem]

Enables TM to poll health information over IPV6, and optionally combine it with IPV4 information for traffic router.

fixes #2735

[alficles]

This is pretty cool. It looks like there are two separate PRs in here, and the second one could really use a squash. The astats changes can stand on their own, so they should probably get their own PR. And the IPv6 for TM should be squashed. There are some confusing reverts of inadvertent changes that probably shouldn't go in, even as intermediate changesets.

It'll be a lot easier to review it that way, I think.

[asfgit]

Can one of the admins verify this patch?

[dneuman64]

+1 to @alficles comments. @serDrem can you please make this two PRs? One for astats and one for TM?

[dneuman64]

This should also be linked to this issue: https://issues.apache.org/jira/browse/TC-230

[asfgit]

Can one of the admins verify this patch?

[asfgit]

Refer to this link for build results (access rights to CI server needed):
https://builds.apache.org/job/incubator-trafficcontrol-PR-trafficops-test/18/

[serDrem]

been absorbed by another PR.