This commit introduces a new module called vultr_network_facts.
This module aims to return the list of networks avaiable in Vultr.
Sample available here:
```
"vultr_network_facts": [
{
"date_created": "2018-08-02 11:18:49",
"id": "net5b62e8991adfg",
"name": "mynet",
"region": "Amsterdam",
"v4_subnet": "192.168.42.0",
"v4_subnet_mask": 24
}
]
```
