Add nagios_host parameter "address6"

[ssm]

The "address6" parameter is used for multi-protocol (ipv4 and ipv6)
monitoring.

• supported in nagios via community patch in nagios exchange
  (http://exchange.nagios.org/directory/Patches/Nagios/IPv6-address-in-host-definition-patch/details)
• supported in icinga

[ssm]

There does not seem to be any parameter specific tests for the nagios types, so I'm not sure where to start on a test.

Also, the icinga documentation for "address6" in the "host" object is at http://docs.icinga.org/1.6/en/objectdefinitions.html#id1330888

[cprice404]

This looks worthwhile, and fairly safe... but I'm not entirely familiar with how the nagios support works.

[cprice404]

Reviewed this a bit further; there are a couple of issues to consider here:

1. As mentioned in the original pull request description, the 'address6' parameter isn't supported by out-of-the-box nagios, so we'd definitely need tests to ensure that this doesn't break anything for compatibility.

2. Nagios has been moved to a module for Telly, so this will need to be re-based against the module repo.

I've created a ticket here:

http://projects.puppetlabs.com/issues/13674

To make sure that we consider this further. Closing this pull request since the file that the patch is against is no longer in the Telly codebase.

ssm--thanks for the submission and for bringing this to our attention, it's definitely something we should be considering.