JCLOUDS-330 & JCLOUDS-416: Use network options in Abiquo

@andreaturli This should allow you to specify the networks that a deployed VM should get the IPs from. You can specify the networks to use with:

```java
templateBuilder.options(networks("networkId1", "networkId2", ... ))
```

If not specified, the current behavior is maintained: jclouds will try to assign a public ip, and fallback to one in the default network for the selected virtual datacenter.

Could you give this a try before we merge the pull request?