Monitor all configured IP addresses for an IP device

[jmbredal]

This is a feature request originally from DeiC, the Danish research network (not verbatim). This should be seen in conjunction with the feature request described in bug 1300604:

The status monitor (pping) only monitors the IP address registered
with the IP device. In the case of routers, ipdevpoll will have collected
a number of IP addresses through snmp polling (then registered
in the gwportprefix.gwip field).

This enhancement to pping is to monitor all the gwip addresses in addition.
This will in effect cover all IPv4 and IPv6 configured on the IP device. This
should be a configurable enhancement for pping.conf.

A new stateful event should be used; "IP address reachability" with
states "IP address unreachable" and "IP address reachable". Perhaps
this should be complemented with "IP address in shadow".

When "Dual stack monitoring" for hosts is implemented the "IP address
reachability" pping monitoring should also cover registered secondary host
addresses.

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Imported from Launchpad using lp2gh.

• date created: 2014-04-01T06:24:22Z
• owner: mbrekkevold
• the launchpad url was https://bugs.launchpad.net/bugs/1300605

[jmbredal]

Partly implemented by #1130

[lunkwill42]

We have decided to merge this with #1130, since their implementation is essentially the one and the same.