Report IPv4 addresses as well as IPV6 addresses.

Original patch for xen-api by Rob Hoes.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #7 from djs55/ipv4-monitor

Report IPv4 addresses as well as IPV6 addresses.