Use one single physical router in mp-vcpe physical insfrastructure.

- Removed other physical routers
- Removed physical interfaces in networks
- Moved creation of IPNetowrks to logicalInfrastructure.
Merge pull request #522 from isartcanyameres/feature/mp-vcpe-phy-with-one-router

Use one single physical router in mp-vcpe physical insfrastructure.