Bug 5212 - Neutron-mapper has dependency on Ofoverlay renderer

Bug 5212 - Neutron-mapper has dependency on Ofoverlay renderer

NeutronFloatingAware - adds NAT augmentation to endpoint-l3
NeutronNetworkAware - creates EXTERNAL_group EPG (as External
  Implicit Group (EIG)) if neutron external network is created
EXTERNAL_group EPG - provides contracts with allow IPv4/6 In/Out
L3-prefix-endpoint 0.0.0.0/0 belongs to EXTERNAL_group EPG
neutron ports where deviceOwner is router_gateway and router_interface
  are not mapped to endpoints
removed unused mappings
removed dependency on ofoverlay
neutron-ovsdb - added portByEndpoint listener which adds port-name to Ep, EpL3
ofoverlay - added listeners for ofoverlay endpoint context - add location(node,
  node-connector-id) based on port name
OvsdbNodeListener - creates of-overlay augmentation with external ports
(cherry picked from commit f9b3d2ffd80c2d623d199d789bff7192b678de40)

Change-Id: If2a582d00f8771c433994154a02febf7c2a702cd
Signed-off-by: Martin Sunal <msunal@cisco.com>
(cherry picked from commit f9b3d2ffd80c2d623d199d789bff7192b678de40)