Add additional debugging

[mikemrm]

This should dump some additional data as seen by the tool to help with failed template renders. Below is an example of the output if no ip addresses are specified.

...
==== METADATA ====
{
  "metadata": {
...
    "network": {
...
      "addresses": []
    },
...
  },
  "network": {
...
    },
    "addresses": [],
    "resolvers": [
      "192.168.1.1"
    ]
  }
}
ERROR:root:An exception occured while processing task 'etc/sysconfig/network-scripts/ifcfg-bond0' with template:
DEVICE=bond0
NAME=bond0
{% if ip4pub %}
IPADDR={{ ip4pub.address }}

...

  File "<template>", line 10, in top-level template code
jinja2.exceptions.UndefinedError: 'None' has no attribute 'address'

[dustinmiller]

Looks great! (assuming tested)