Feature/move capabilities out of builder

VRRP and IP methods moved out of VCPENetworkBuilderCapability.

Two new capabilities have been created: 
- VCPEVRRPCapability
- VCPEIPCapability

We have now to re-think if these capabilities have sense in all VCPEs, or if their implementation should be template dependant, like builder capability is.

Related to issue:
http://jira.i2cat.net:8080/browse/OPENNAAS-835