Configure Neutron to Connect to EFA

[ml2_extreme] 
efa_rest_token = <efa_api_token for VIM_1> 
efa_cert_file = /root/gcla/extreme-ca-chain.crt 
efa_secure_mode = True 
efa_port = 443 
efa_host = efa.extremenetworks.com 
use_fqdn = false 
region_name = VIM_1 
region_shared = SHARED_TENANT 
#SHARED_TENANT is the name of the shared tenant created on EFA    
fabric_name = CNCF 
[efa_topology] 
efa_link_mapping_file = /home/ubuntu/link.csv