Implement builder for mp vcpe template (without static route).

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.

Static route configuration is missing at the moment.
Keep templateName for networks in mp logicalForm jsp.
Fix errors in start/stop LRs in MP VCPE builder.

- Add session context before starting LRs. Contexts are copied from parent physical router.
- Try to stop a LR only when it is in ACTIVE state.
Use hierarchical names for LRs in MP tempplate.

LRs name is now the vcpe name concatenated with previous LR name, in the form:
vcpe-LRname
Fix in mp vcpe copy. Copy vcpe name and id too.
Add workaround in mp template buildmodel.

buildModel assumes given VCPENetworkModel contains both logical and physical infrastructure.
However, received model does only contain logical infrastructure.

This patch applies a TEMPORAL workaround, consisting in generating physical infrastructure with default suggested values
and merging it into received VCPENetworkModel.
The workaround ignores changes the user may have introduced in desired physical infrastructure (if any).

The workaround should be removed when GUI sends physical infrastructure together with logical one, when calling buildModel.
Update mp.suggestor.defaults.cfg to use available testbed.
Merge pull request #532 from isartcanyameres/feature/mp-vcpe-builder-capability

Feature/mp vcpe builder capability