Feature/mp vcpe builder capability

This patch implements mp vcpe template builder according to mp template.
The builder creates logical routers and configure interfaces in them.
It is also able to remove them. And does so if creation fails.

Static route configuration and other routing is missing at the moment.

This patch introduces a temporal a workaround in commit e2bffa2, which must be removed when it is no longer necessary.

Related to issue: http://jira.i2cat.net:8080/browse/OPENNAAS-868