Teardown/setup server enhancements

1. Manager: pass neutron_net_id and neutron_subnet_id in
network_info to setup_server. Pass server_details and
security_services separately to teardown_server

2. Drivers: renamed setup_network/teardown_network methods
to setup_server/teardown_server

3. Generic: pass server backend_details to
set_up_service_instance and delete_service_instance

4 Service_instance: removed passing share_network_id to
setup_server. Return router_id and subnet_id from setup_server.
Added readable naming to service_subnet

Partially-Implements bp setup-teardown-server-enhancements
Change-Id: I9f5ff26fa2635e352043aedf8dde3514deaaba30
Merge "Teardown/setup server enhancements"