Timeout value for getting the ip address should be configurable

[sthaha]

Currenly libvirt/server.rb has a hardcoded 60 second wait.

401 if count >= 60 then
402 raise KytoonException, "Failed to lookup ip address for #{inst_name}"
403 end

Could be make it so that user is able to specify the dom//interface/source" to wait for (first one by default) to allow cases where there can be 2 or more network adaptors and kytoon only needs to care about one/default interface