- create L3-VPN per tenant
- update README.md
- update    parse()   @ InterfaceCounter.py
- update    compose() @ NetworkInstance.py
- update    compose() @ NetworkInstanceInterface.py
- implement parse()   @ NetworkInstanceInterface.py
- update    compose() @ NetworkInstanceStaticRoute.py
- implement parse()   @ NetworkInstanceStaticRoute.py
- Fix MonitoringThread.py


there is an error removing static routes that makes unitary tests to crash
uncomment commented check_config_network_instance and validate

- implement L2 VPN with BGP
- implement L3 VPN with BGP
- test static routes with ping


- test delete service

homogeneize attribute names
/network_instance[teraflowsdn]/interface[Ethernet1.0]	
  id: Ethernet1.0
  if_name: Ethernet1      <<< 1
  interface: Ethernet1    <<< 1
  name: teraflowsdn
  sif_index: 0            <<< 2
  subinterface: 0         <<< 2

- update README.md
