Feature/ospf-api

ReadOSPFConfiguration exporting the OSPF configuration trough API. It returns the list of ospfAreas and every ProtocolEndpoint in all of them. Example:

```
<ospfService><ospfArea><areaId>0</areaId><ospfProtocolEndpoint><name>ge-2/0/0.13</name><enabledState>ENABLED</enabledState></ospfProtocolEndpoint><ospfProtocolEndpoint><name>gr-1/1/0.1</name><enabledState>ENABLED</enabledState></ospfProtocolEndpoint><ospfProtocolEndpoint><name>gr-1/1/0.2</name><enabledState>ENABLED</enabledState></ospfProtocolEndpoint><ospfProtocolEndpoint><name>gr-1/1/0.3</name><enabledState>ENABLED</enabledState></ospfProtocolEndpoint></ospfArea></ospfService>
```


Resolves issue [ http://jira.i2cat.net/browse/OPENNAAS-1263 ]